...to make the Phoenix another mutant? I mean, the more I've watched X3 the more I've come to be irked by it not only on the technical, filmmaking levels, but also just on its overall lack of creativity or effort to tell a compelling, well-paced story. I think something everyone agrees on is the diservice payed to Phoenix. Honestly, instead of the Phoenix Force being some cosmic entity, it would've been interesting and a tad more thematically compelling if the Phoenix was simply another mutant, incorporeal, that Xavier and Magneto were aware had existed for many, many decades...perhaps the very first mutant even, or so they suspect. Jean was discovered by Xavier at a institution, where her powers were driving her insane and out of control. To keep Xavier from being a total unethical jerk, Xavier -- to help heal Jean's mind -- helps Jean control and restrain her limitless potential. This is a decision they both came to, not fully understanding its consequences. During thesesesions when Jean was a child, Xavier discovered -- and kept from Jean -- that the Phoenix host had been attracted to her because of her enormous sense of power and potential and bonded with her, stunting her ability to control her power. Xavier's therapy sessions with Jean -- done with Jean's consent so she could have a normal life -- also helped Xavier cage the Phoenix force, which he feared as a primal, unstoppable force that would seek to exterminate and cleanse any genetic inferiority. Thus, the Phoenix is still a "cleansing" force. With the events of Alkali Lake and the Dark Cerebro Effect, the Phoenix began re-asserting herself over Jean until we get Dark Phoenix.