I didn't see magic wasn't allowed. If Cloud had Knights of Round then forget about it. Sneak Attack+Kotr = Dead America. As it stands now, no HP+ or Double Cut materia is going to hold up against that shield. If he got a Limit Break he could win but he'd die way before that. He would have to Limit Break before the battle, and come in with a bunch of mastered First Strikes, and hope that one Omnislash is enough.