Makes sense, but if the form doesn't last, Cranky won't have much of a chance. In fact, he'd automatically lose. lol. If the potion keeps him young unless he drinks a potion that reverts him back to normal, would that let him be the original Donkey Kong for the whole thing?
Cranky: You'll be wishing you never met me.
Cranky drinks the potion and becomes bigger than Donkey Kong, with muscles and everything. Mysteriously, he also gets an unlimited supply of barrels. Cranky picks up and throws some barrels at his enemy.