Concerning Eagles: It seems that in terms of literature, everytime the Eagles appear in Tolkiens work it is some kind of Deux ex machina kind of way. Its interesting, because the Eagles are the kind of missionaries of Manwe, in a sense (they dont go around converting people, but they are his sort of representations in mortal lands). Everytime the Eagles show up it seems to modify the plot greatly whearas if they hadnt. The Dwarves might have had to trek endlessly until they made it across the Andunin, and delayed Gandalfs coming to Dol Gulder and the White Council. The Battle of Five Armies might have been a loss, or more Pyrric. Although the Eagles attcked the Nazgul at the Black Gate, we can see this led to Mount Doom. And of course, we might have had a wizards corpse on Orthanc.
Considering Gollum and the Eagles, it brings up that interesting point of fatalism mentioned. I think that in Arda, all things excluding Eru and the Valar for the most part are meant to be. Now, part of this is Mandos. The prophocey of the Dagorath proves he Eru and Manwe and anyone else know of the last battle with Melkor. However, I do not think that they know each and every thing that will happen. The Valar have the Fire, so they make choices; yet the ones that seem the most important come before the Elves. That is mainly which Ainar went with Melko and who stayed with Manwe. After then the choices are mostly one-sided. The War of Wrath is no exception; whenever Morgoth created Mass war that was destroying Middle Earth, the Valar were the only ones who could stop him if no oine else could. So I think, like Gandalf predicted, that the Ring would be destroyed, but the manner of "how" is the unknown. The destruction of the Ring, at least when spoke about the most Wise (Gandalf, Elrond, Aragorn, etc) was always hinted at as,"You realize what would happen if Sauron and the RIng wernt destroyed," even though it would mean,"We known that Sauron is fated to be destroyed eventually(couldnt survive the Dagorath if it was that long) so lets take him out before things get any worse."
So I dont think Mandos and Eru knew that Ted Sandyman would be a pain, (doubtless they had the power, but that was not what it was for) but I think they knew that a being named Gandalf would aid Free Peoples including the Little People to bring about the destruction of Sauron, and a sebret Blueprint and DNA sheet of Balrogs and their bodily extremities.
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