Ruiz would outbox and outpoint him with faster combinations. Tua's only advantage is his greater one punch power and enough to knock Ruiz down, but as we saw with Joshua he just got back up and dropped Joshua that same round. Would he drop Tua? Probably not, but he would definitely put a hurting on him. I only see Tua winning this if he's up against the super fat version of Ruiz like in Joshua 2. If its the Ruiz from Joshua 1 then nope.