I'm struggling a bit with the primary question.
The
Valar were the
Ainur who chose to enter Ea.
Maiar and Ainur are different altogether, Maiar being servants of the Ainur.
So if
Tolkien were Maiar, he could not be Valar.
Istari were also Maiar...just assigned to a different role.
Of course, Tolkien himself said he was a
Hobbit in all but size, so if we want to speculate, given he created an entire world and all the beings in it including
Eru, I'd say...well... he's a bit above them all somehow.
😁