I mean the Discipline skill is somewhat lower your stats to match your opponent's in FE9 (in FE10 it doubles weapon exp receives instead right?). But if you hack the game and use Greil or Boyd, they would still have horrible stats no matter what enemies you fight (something like 6 str, 5 spd 2 def etc).
My point is if Ike's stats is lowered down to that level, everyone can beat the crap out of him, maybe except herons...