i wonder how frank would do against a full on phoenix level tp assault.... both are def significantly more powerful than galactus (even standard phoenix was more powerful and that was with a much lesser user). i don't know tbh. jean was getting more and more powerful. i think based on feats you're probably right, but with dp i think some speculation isn't really out of bounds given how fast she was gaining power. i think this would be a titanic showdown.
I half-remembered him expelling the celestial from his mind as, and I found it: http://i.imgur.com/U56uMZa.jpg [worth noting is that he's a child there]
Frankling seems more -- I dunno, casual about his power? Like he's coasting through feats. Just a gut feeling that when he presses on the accceleration he'd win.