Well, the theory of Jean creating the Phoenix has been floating around for a while and it's one that Louise Simonson has hinted at in X-Men Monday. But basically my post is yes, Jean creates the Phoenix Force. As for Jean's inner enemy it really depends. If the Phoenix Force was originally created during Jean's trip on the shuttle and transcended during Phoenix's death in 137 then I could see that inner enemy tracing their origin to the Dark Phoenix persona that was born as a consequence of the Hellfire Club's attempt to brainwash Phoenix. If the Phoenix Force is born during the solo then maybe things could get more complicated but the inner enemy would be a consequence of Jean's darker thoughts and regrets.
I get the feeling that while it seems that Jean Grey 2 did not progress much maybe it foreshadows something that will make sense in the end.