The Maiar/Valar relationship seems to have been far more fluid than is usually recognized.
Some Maiar, most notably Gandalf but also Melian, serve or have served more than one Vala. Melian is named as a follower of both Vana and Este. Olorin is said to have served Lorien, (judging by his name he was originally associated with dreams or visions) but became a disciple of Nienna, (Lorien's sister). According to 'The Istari' in UT he was then chosen by Manwe and Varda as their emissary to Middle Earth.
What this suggests to me is a Maia could 'diversify' his/her interests serving and learning from more than one of the Valar either simultaneously or serially. And that career change was a definite possiblity [img]smilies/wink.gif[/img] .
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