From the above Wiki entry:Jackal wrote:The Phoenix did not create a clone of Jean Grey. The clone of Jean Grey was created by Mr. Sinister and the clone's name was Madelyn Pryor. Sinister created the clone because he knew that the genes of Cyclops and Jean Grey could potentially make the "perfect" mutant. They did eventually have a child and that child was Cable.
And maybe I shouldn't have used the word "revived" but it was the phoenix that was responsible for resurecting Jean Grey.
"Now thinking that it was really Jean Grey, the Phoenix Force put the real Jean in a cocoon to heal and went on its business as Jean Grey, except now it was calling itself Phoenix"
The "Jean Grey" who died in the battle with the Shi'ar Imperial Guard was actually the copy created by the Phoenix. The real Jean Grey was in stasis the whole time in a cocoon.
And if you doubt the Wiki entry, here is the actual note direct from the marveldatabase
"Acting on her wish to save her teammates, the Phoenix Force placed Jean Grey within a protective cocoon and replaced her with a duplicate."
There were 2 copies of Jean Grey - one made by the Phoenix (who died in the Shiar Imperial Guard battle) and one made by Mr. Sinister (Madelyne Pryor).