I think your rankings are more complicated than they need to be. Morgoth was obviously the most powerful of the Fallen. Sauron was an especially powerful Umaia, but I do not see any reason to put him in a different class than the Balrogs. They were all the same, they just possessed varying degrees of power.
Also, Ungoliante was not an Umaia.
I think that it was possible for a spirit that had died as an Incarnate to be reembodied by a more powerful being.
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