1) He’s not.
2) There was no vetting process, because he’s not an Avenger. And even if there was, Iron Fist isn’t currently an Avenger, so there’s no reason why he’d specifically be asked to weigh in on the matter necessarily.
3) Sabretooth’s purpose as a character is to be a character. And many different stories can happen to a character. This is one of them.
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