Dragon's Flame, Magical?

[cesar.ewok]

Legate, Tolkien actually states that the Eagles had no spirit:

Originally Posted by Morgoth's Ring, Myths Transformed

The same sort of thing may be said of Huan and the Eagles: they were taught language by the Valar, and raised to a higher level - but they still had no fëar.

Can we assume this is a canonical conclusion? Tolkien states it very conclusively, and it is, as far as I know, his last word on the subject.