@ssjsuperman: idk i think itachi, kimimaro, and minato will take
itachi would use his mangekou sharingan on sephiroth and plunge him into a genjutsu where he wont be able to get out. kimimaro would slice him up as seph is trapped in a genjutsu. minato would run around in a circle cause their would be nothing to do xD
but seriously i think the itachi kimimaro and minato would win even tho itachi would take him himself probably.