It is probably Gwaihir Lord of the Great Eagles, whom we assume, along with the Ents, are Maiar according to 'Of Aul’ and Yavanna' of
The Silmarillion,and being such are so long lived that he would still be in charge. However, in
RotK after Sauron and the Black Tower fell:
Quote:
'Twice you have borne me, Gwaihar my friend,' said Gandalf. 'Thrice shall pay for all, if you are willing. You will not find me a burden much greater than when you bore me from Zirakzigil, where my old life burned away.'
Which means once was from Isengard to the outskirts of Edoras, twice was from the mountain peak above Khazad-d’m, and thrice would be to rescue Frodo and Sam from the lava flows of Orodruin, which doesn't leave a trip to rescue
Fifteen birds in five firtrees. But this has been a digression anyway, for were speaking of the Battle of Five Armies, not provideing taxi service for Istari, so I'm buying into it being Gwaihir in both stories.
Mungo gets the pretty bauble and I think the Eagles made a parlementary ruling that declared an election at that time was out of order.
What were collected in the Wells of Varda