I mean you aren't wrong - that is a bold statement and considering the source - a powerful celestial it does sound pretty definitive. I guess initially I expected more of an explanation of the connection or even origin of the connection - and I have a few ideas I've posted before like I would say that Jean is the descendant of the cavewoman Phoenix or something like that.
But I do love this issue and I think the issue stands on it is own and is a powerful work. I guess my ideas came from how it was billed and I think that is why a few folks are disappointed but I think those folks are the minority. I am thrilled and overjoyed with the issue. I think it leaves Jean in a great place to continue to move forward. I am very excited to see where Duggan and others take her.
Gillen nailed it and definitely understands Jean Grey.