Super Mario Odyssey - WHO WIN ?

Actually, Mario would be the winner.

Kirby will just have Mario inside his mouth (Kirby will just be on his fat form before transforming)
Cappy would land on Kirby’s head before he could swallow Mario
Kirby will be stunned by the cap effects
Mario’s particles will come out of Kirby’s mouth
Mario possesses Kirby

Oh shit, you'll create a paradox!