unfortunately, you can't take away X-Men. so don't assume.
You can't say a CHARACTER is A-list but then not allow me to take his team away. Then at that point it's not about the individual it's about the team, which then proves my point.
Making money is a factor so is having a lot of appearances in other and all forms of media.
Being on a bankable team doesn't mean the members can't become A-listers.
Having alot of appearances in all forms of media is only a factor if the those appearances are specifically about that character. Otherwise you can't say how much that character is actually contributing. Being on a bankable team doesn't mean members can't become A-list because otherwise nobody would be A-list because most bankable heroes are on popular teams, however if the the character doesn't matter WITHOUT the team...then they aren't A-list.