You... you're trying to brainstorm in a Phoenix thread. Goddamn it, you stole my idea! Or I stole yours...
Just my two cents on Jean and the Phoenix:
No, the Phoenix is not Jean. The Phoenix is the force of life itself. It is balance within the universe. To achieve balance, the Phoenix must destroy the 'dead ends' of creation so that other life can begin.
But on Earth, something new to that planet has surfaced: mutants. Perhaps they are merely isolated quirks in genetic material. But maybe they are the evolution of mankind, 'homo superior' as Magneto likes to say.
And one mutant, Jean Grey, with her mutant powers, called upon the power of life itself, the Phoenix, to save her friends, and in the comic, to save the world. However, the Phoenix is not a sentient thing. It is not mortal. It cannot love, cannot feel. It has only a purpose.
So when Jean calls this infinite power into herself, she becomes something else entirely. Through Jean's eyes, it sees that humanity may be destined to become extinct, its focus tainted by Jean's mortal experiences. Through Jean's mind, it develops a voice. Through Jean, the Phoenix finds a purpose: the destruction of humanity.
When Jean 'died', she incubated herself in the lake, waiting until she could gather her 'peices'; to develop the ability to control the Phoenix. But through an unfortunate accident, she is woken up too early. She is confused, unable to control it. In any case, such power cannot be properly contained within a mortal body. This is what takes away Jean's ability to reason. She becomes a destructive force that destroys through perception, not natural selection. She becomes the Dark Phoenix.
All she has left is her love for her friends and family, and her compassion for humanity as a whole. She is the Dark Phoenix, but she is still Jean, fighting to make things right. She knows that the Phoenix does not belong in a mortal body; she knows she needs to die to save the world. That is her struggle.
Well, that's been a fun explaination/brainstorm session. I need to write this all down.