This comic kinda took a swerve there near the end. I recently reread that issue of Young Justice when they accidentally kill Santa Claus, so it was kinda taken from that. That and the whole “ALL MYTHS ARE TRUE” thing that comics tend to embrace.
It seems like most of the X-Men’s members with more distinct physical mutations tend to show up on the teen teams and stay there. (Rockslide, Anole, Indra, Skin, Chamber, Bl!ng, Penance, Mecury, etc.) There are a some exceptions to this, yeah, but generally speaking I feel like a more human look tends to get you on the higher profile teams.