Zigūr,
I really like your commentaries but am going to question this one. I did not come across any place where Tolkien states that Istari's powers were limited in any other way than via prohibition to exercise them freely. I tend to think they retained there power as Maiar but were ordered to hide it and use only in the situation of emergency. Incarnation does not necessarily limit supernatural powers and we can find an example in Christian theology.
I do not think Sauron would imagine a Maia who would reject the Ring.
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