User blog comment:AskaniSon/Marvel Comics Will Use Avengers vs X-Men to Reboot its Universe/@comment-4590769-20120619213644/@comment-4206371-20120624094746

Ultimate Marvel is slowly went and is still curently going through its reboot. They just chose to not redo the entire universe and instead reworked a few things with what they had left, from either just leaving it out, or from untold/ unmentioned stories.