Someone's probably going to go nuts with that, but Sephiroth has controlled multiple bodies as far back as the OG, and the fabric of reality was having a very bad day during the last fight. Seph wasn't doing some True Form Darkseid impression, he was just yeeting Jenova cells across (already broken) dimensions to keep the party away from Cloud so he could 1 v 1 him. Which didn't work because Zack and Aerith are almost as clingy as Sephiroth is :skully The entire series would collapse in an instant if someone would just teach Cloud what a restraining order is.