Hell yes!
Absolutely!
Sooo how come healing and even being brought back from death never seem to do squat about that whole uncontrollable Optiblast thingie. That's some selective healing right there. I know it's partially in his head but even Xavier had a grace period before his mind forced his legs not to work.
That injury is incredibly old - unless looking for it specifically I'd imagine that most things doing any healing would just presume it's something normal. Being brought back doesn't heal every single scar a person has in most cases either. Nor does it undo the Super Soldier Serum or other forced mutations that non-mutant characters have.
Dark does not mean deep.
"Listen to me...you can't kill an idea. It always comes back. Resurrected. Or reborn...into a different form." - Cyclops, Secret Wars