Crusader is wisdom AND strength I believe(STR+WIS/2)
This is so that the non-fighter types like erudites, high elves, etc. won't have more power than ogres, trolls, barbarians, etc. but due to their magically effinity they get a slight boost in power being a fighter that is magical vs a pure melee fighter. The more brawny races in turn get a slight loss in power for pursuing a fighter type that uses skills they aren't racial equip for although they'll still have power than a caster oreinted race on the path of the crusader.