Well even if Donkey Kong could overpower Bowser can't he like jump in lava or hide in his shell or something. Then Donkey Kong couldn't even touch him. So Bowser could have alot more strategy during fighting also considering he can spit fire. The only thing I see Donkey Kong doing is throwing a barrel or two or jumping on Bowsers shell... which would kinda hurt...
You guys are gorgetting that Donkey Kong had a Coconut gun is DK 64. If Bowser breathes fire at DK, Dk can just shoot a coconut into the fire. The coconut will start on fire and hit bowser for even MORE damage. OWNED SON.