I don't consider them.
Some might if they're hard core completests'. It more of personal opionion here.
As a bust completest, I don't consider the alter-egos as part of me considering myself a completest.
1. Faux bronze
2. Not a superhero
3. Couldn't buy them separately
I buy for the painted Marvel super character. Not for bronze. Not for the base. Not for the number on the bottom.
With that being said, the first piece I'd sell out of my collect would be Gold Bucky. Then it would be repaints.
Only way I would buy a faux bronze, is if it was a character not released in color. Then I'd just have it painted.
Not sure what you mean Denny on the Ultimate Cap. Is it because the character isn't from the 616 Universe? If so, that doesn't matter to me. He's still Marvel.
B/W Cap is another story. He's not from the comics. He's before Marvel was Marvel.