Yes they are all Gamma mutates so given what ewing is doing they are all immortal. Doc Samson in particular would be a boon to Arrako and getting into the minds of it's citizens. But honestly each could offer so much. Creed and his ability to touch something and take on it's properties. It would be a feel nice upgrade for them too imo. Even Rick Jones who is out of sorts may feel normal on Arrako. And hulks love a good fun fight.