Specter:
I'm sure the bonds they inevitably form will be all the stronger for having been tested time and again.
I wanted to touch on this point. I'm 100% fine with characters disagreeing or taking different paths IC, but as a player (and a GM whenever I run games) I really prefer to make sure everyone is on the same page OOC. That gives me some time and context to come up with a post to help build those bonds. If not, then it forces either the player or the GM to be the "adult in the room" who brings everyone back together. And frankly, that sucks unless you want to play that part.
Like, I'll give what I see from Mordred's point of view: We were gathered by a wizard to save the multiverse. Specter challenged the wizard, immediately ditched us, and returned just in time to take a shot at Kid Hyperion. And that's after Mordred followed Valkyrie's lead to talk with Sluggo/Juggernaut and saw Kid Hyperion dash those attempts by starting combat. Why would Mordred want a loose cannon on the team?
The bond that brings us back together is probably something we should build before testing it. Otherwise, why would my character care?