Rings of Power & Osanwe-Kenta

[Neithan]

I would rather say that when Sauron was using the One Ring and the others the lesser rings (3 Elven, 9 men, 7 dwarves, etc) that somehow the Rings made the wearers of the Ring unable to close their minds from Sauron using the One Ring.

I had a similar thought. I think that in order to use the Rings they had to "open their minds to them" that is, they had to use this "mind power" to use the Rings and so the Rings became tied to that power. And so through the One Ring Sauron could get around their "unwill".
This raises the question, shouldn't Gandalf and others be able to shut their minds to the temptation of the One Ring?

If Sauron himself spent 57 years in Númenórë with a hröa, wouldn't that be time enough for him to become attached to it like Melkor was? I think that it was enough, but it seems that he was able to change the form of his.

57 years is nothing to a Maia, it probably wouldn't make that much difference. If he was able to change the form of his hröa, then he couldn't have had that strong of a bond to it.