Did no one wonder why, just before Jean's resurrection, there was an adult Jean Grey running around on Earth? Why she was existing as a psychic ghost like Maddie did back in the X-Man comic after she had died? Only unlike Maddie she didn't have Nate Grey to draw power from, so she could barely manage to even make herself seen or heard.
That Jean clearly wasn't in the White Hot Room awaiting rebirth, so who was?