Iceman hasn't fully explored the maximum capabilities of his powers.
Then he shouldn't be classed as a Omega-Level Mutant until he does. No matter if someone posses him or something. Because you could argue that Apocalypse or Toad or something haven't explored the maximum capabilities of their powers.
I's like I have the potential to drive butt in till i actually bother studying , taking the test ect... I can't be called a "driver".
Not trying to start anything just saying how I see it.