Between 2002 and 2004 New X-men came out and it reverted back to the original Phoenix interpretation where being a Phoenix was a mutation and that Jean as Phoenix had merely reached the point of “ultimate mutation”. It carried on the idea of a central power reserve with its Crown/Phoenix consciousness which bonded with avatars to carry out its work across the multiverse from inside each of its universe, hence the Phoenix Corps. It also supported the original idea that Jean was Phoenix. Jean had previously (during the 86 retcon era) always made a distinction between what herself and her inherited Phoenix memories. In New X-men she claimed responsibility for them and referred to the Dark Phoenix costume as hers. On top of that after her death at the hands of “Xorneto” Jean was reborn in the golden woman form that previously appeared to her on the space shuttle, the same form that was presented in the retcon period as a separate being. This was a conscious effort by Morrison to show that that was no longer the case. GM having Jean reborn from the phoenix egg had the effect of introducing the egg/cocoon to the Phoenix life cycle which further blurred the distinction, between Jean and Phoenix. With New X-mens kaballah flavoured talk of our archetypal forms existing in the white hot room, prior to our physical birth this at first suggested that the golden woman on the shuttle was Jeans archetypal form manifesting through Jeans sentient mind.
That’s one theory however far more conclusive than that is Jeans meeting with Death in Classic X-men 43( 86retcon era to boot!!):
As ive said all along Jean is a direct manifestation of the power of creation, The Phoenix consciousness. She just never knew it.
-The implication is that the “phoenix force” that wandered around the MU bonding with Madelyne and Rachel is really always the part carved from the spirit of Jean Grey. This seems also to be the interpretation of Greg Pak in Endsong 5:
-This is indirectly confirmed even in Excalibur 64.When the Phoenix awakens Rachel in space to bid her farewell,Rachel asks her to show herself,and she appears in the Jean Grey “Gold Woman” form: “Mother...You look like my mother...like Jean.Jean Grey”.
-Rachel doesn’t gain her Phoenix power until she applies her power to the Shi’ar holempathic crystal which contained the essence of Jeans being:
Relating this to what we’ve been saying about the Phoenix consciousness and the Phoenix manifestation. Jean apparently is the human form of the 616’s Phoenix manifestation and as a true avatar she has a special relationship with the Phoenix Consciousness that makes her the White Phoenix of Crown.