You know, it occurs to me that Aule:
1. doesn't have a great track record when it comes to his Maiar (Sauron aka the Maia Formerly Known as Aulendil, Saruman)
2. didn't seem to have introduced his Maiar to his creations (or at least, they seem to take little heed of Dwarves; I guess one could attribute this to a built-in failsafe)
From the LJ of
You are a Maia of Yavanna Kementari, Queen of the Earth
Whose Maia are you?
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Banazîr