Genius At Work

The last boss of "Marvel vs. Capcom" is Onslaught, who, as we all know, is a psionic merging of Professor Xavier and Magneto. However, you can still use Magneto as a helper character while fighting Onslaught. Are we supposed to believe that there are, heh heh, two Magnetos? Oh, I sincerely hope someone got fired for that blunder.