Let me just say, I am learning stuff that I never knew about the books and there is quite a lot that I have forgotten. I have read the Lord of the Rings about eight times and I read the Hobbit twice, and I read the Silmarillion twice too and both Unfinished Tales as well, but I have to admit that those last books, the hardest to read books, I read in high school, which the professor said he could not do; I may have missed a few things. I did read the the poem about Beren and Luthien more recently and the Tale of Turin when it was released separately a few years ago.
The Tolkien Professor is a theologist and decidedly so, blatant even. But that is a good thing with Tolkien, because he was too, even if it does not show through to his writing explicitly. As an atheist it took me many readings of the books to make the connections, which was so different from my experience of reading CSLewis' Tales of Narnia, pillow vs sledgehammer. The religion within Middle Earth is made up almost entirely and unlike this world, the gods have an affect on the world.
The entire Middle Earth name is that of Religion. Growing up I thought it did not make sense as the Valar had their own continent and the continent in the first age had sunk, so why was this continent called Middle Earth? Middle Earth is the mortal realm, the lands between Heaven and Hell. Simple really, but also very Christian.
The Tolkien Professor says a lot of things from the plot shows divine intervention and the gods moving people and weather to influence decisions, but he does not make the leap that I did and saw. Hobbits were created to be ring bearers. The proof is two part. First hobbits are not one of the created races and they materialized in the correct time and place to acquire the Ring, the One Ring, and before that they did not exist. Two no other race in creation had the power to resist the power of the ring so well. That they were so the opposite of being beneath its power is evidence of this.
The history of the hobbits. The hobbits were first known to the peoples of Middle Earth in the Third age. The Rohan had tales about them in their histories from their time in the north, just south of the eaves of the Greenwood (Mirkwood), and although it does not state it the Elves would have had contact with them there too. From there they migrated to the other side of the Misty Mountains and to the West after the fall of the Kingdom of Anor. Roughly to the Shire. And there they stayed and did not move for nearly 1500 years. Another oddity to be sure. The local people knew of them but not many others, they slipped into mythology to all. The Men of the South, Gondor, knew of them as halflings, but that was likely because their lands extended to where they lived in early Third Age, on the banks of the Great River, near the eaves of the Greenwood.
But there were some isolated races that had never heard of them before. The Ents for one. In the beginning they roamed far and wide over Middle Earth, they explored everywhere. In the Second Age they roamed far and wide looking for their Entwives, but in that time they catalogued all the great races and put them to song, indeed knowing Ents, they probably rolled all the living things into one song to have a comprehensive list of things, but they did not have any line for a hobbit. Nothing. So much so that Treebeard had to add a line to the lists for them and the Ents had to discuss it. This means that sometime in the Second or Third Ages a new species, a new race was created and put in place. Point one proven.
There is still the possibility that the hobbits might have ducked and hidden themselves from Entish notice, but this seems unlikely given that hobbits are extremely inquisitive and social critters even if isolationists. They tend to dig and investigate their immediate surroundings. If an Ent had entered their preview, they would have found it and Ents on their part are very observant and have a tendency to stop and smell the air for days at a time and just act like trees, so that the two did not encounter each other before the end of the Third Age, an age when both were isolationists, is suspect.
There have been a grand total of Five Masters of the One Ring, three of whom were hobbits. Sauron, Isildur, Gollum, Frodo and Sam. Sauron forged the ring last after his escape from Númenor and upon forging it, all the others became aware of it and war was declared. The One Ring was chopped from his hand and Isildur claimed it, and he possessed it for years before he headed North where he died and the ring was lost in the Great River on the eaves of the Greenwood. Gollum "found" the ring, murdered the hobbit that found it, and slinked and slunk for years around the others and was later driven away and later under the mountains. In all Gollum had the ring for over 2500 years, so long that when the Wizards arrived the Ring was safely ensconced deep within and under the mountains.
When Frodo offered the Ring to people during the quest, Galadriel, Aargorn, Gandalf, and the Council, none of them want it, because they fear it's affect, the Men it affects the strongest, Boromir just traveling with it becomes overcome by it, but living with it for years the hobbits resist. They it appears have an inner will that none of the others have, the people in the books suggest that they don't have the power to be corrupted, but it is more like that they are not affected as strongly, like they were made that way.
In the movie, which differs from the book, Isildur decides inside the Crack of Doom to keep the Ring, but in the book it was immeadiate, merely on the slopes where the battle occured. Frodo, who had it and had worn it for years, did not succumb until the last moment, he resisted for the entire journey. The Ring was designed to rule the other great Rings, to rule the Elves, Dwarves and Men, but not the hobbits; they are made of something different. When Sam puts on the Ring despite being so close to the place where the ring was made, he is freely able to give the ring back up to Frodo when he asks for it back. He has just spent a while using it too, more than Frodo had used it recently. Remember how much Boromir was affected by just being in its presence and not even wearing it. Sam has been closer to it far a greater period of time too, with no possessive feelings toward it.
Besides the resistance to the Ring there is the resistance to the evil of Sauron in general there are the coincidences that are peppered around, of course it must be noted that the Hobbit was written without the light of the Lord of the Rings slant, it was a children's story not connected to the plot until after the Lord of the Rings was written. Tolkien did rewrite the Hobbit after LotR was written however, so the slant was repurposed in the Hobbit.
One aspect that also must be considered is that the Valar were taking an increasingly lesser direct role in the events of Middle Earth, but that does not mean that they were ignoring them. They directly involved themselves with Morgoth in the First age, but in the second age they left it to the Elves and Númenorians. In the Third age they took a more indirect hand by bringing forth the wizards, but still it looked like there was some movement from possibly Eru Ilúvatar, the creator of the Valar and of everything. I say this because of the first argument, that hobbits were unknown to the Elves and since elves are favoured of the Valar they did mention hobbits in the Silmarillion at all. It is like a push that changed the fate of everything. Of course, the creation myth of Middle Earth says that the song was told to the Valar and then they were to create it, so they could have adjusted wrong notes of history to become true by making these small adjustments.
The unlikely events are that Gollum found the Ring, that Bilbo found the Ring and not a goblin and the series of unlikely events that got the Ring to the Shire. In LotR when they select two additional hobbits that allow for a decoy party. Pipin meddling with things beyond his power allowing Sauron to think that Saurman had the Ring, the Nazgûl surly informed Sauron that Saurman was was unseated focusing his attention on the West. The little nudges that push the real ring bearers to Mount Doom just at the right time. This all suggests divine intervention.
Given the above two arguments and the rest of the seeming coincidences from the Hobbit and the Lord of the Rings, it is clear that divine intervention occurred and it was written with that in mind. Certainly it could be said that I am grasping at straws to explain inconsistencies from the two stories, but given the complexity of the back stories of the other races and given the prominence of Hobbits in the two popular stories, the clear lack of explanation of this one species suggests their divine and sudden creation to fit a role in the story of the destruction of the remaining prime source of Evil in Middle Earth.
One question that I have that I would like to ask the Tolkien Professor, maybe I will ask him, is if Orcs are immortal like elves, they were created from elves after all.