Actually Bowser and Dedede are not bad, if not mid-high tier. I thought Bowser was among the top for a while. Plus, K Rool would likely have what Bowser and Dedede do not, and that's a bevvy of projectiles.
Edit: Oh god, envisioning a heavy weight projectile/trapper makes me think of a combination of Bowser and Villager. Could you imagine Bowser with Lloyd Rocket / Tree / Slingshot spam?
Edit Again: People keep calling the Heavy/Projectile/Trapper the same archetype Snake had, and he was among the top tier in Brawl. If K Rool goes down that same path, I think he'd actually turn out at least decent. ESPECIALLY if he takes Snake's recovery via his Roolenstein helicopter pack. Even if K Rool was last place on the tier list, most people here would still try to main him and make him work.
I play Charizard.
I know of these things.
Still don't believe me?
I mained Pichu in Melee.