LOL. I can see where it would be difficult to beat Sephiroth without the Knights of the Round summon. I had all the characters when I beat him both times I completed the game. And both times Vincent was one of my strongest characters so I don't know if I could have done without him. But I could have done without Yuffie and Cait Sith. They were my third party that stood back and healed my characters during the battle
