Board Thread:General Discussion/@comment-26873003-20150809191532/@comment-1141856-20150818050934

Cream and Horus show the most potential without need for a necessarily smart or clever user. Sethan is powerful but needs a user who can move stealthily to be most effective. It's the opposite of a later power that belongs to an execution squad, so it's definitely a strong one if it's used correctly and without its user hindering its potential.

If it were to be strongest user, I'd say D'Arby. He only lost because Jotaro is a very convincing bluff.