I think it's actually Kunigami despite the suspense. See, the panels were drawn in a way to make us think it's not Kunigami. But that doesn't necessarily mean it's the other dude whose name I forgot. It can also be interpreted as "it's not the OLD Kunigami", as in, he changed so much that they almost couldn't recognize him.
He faced someone who was the complete opposite of what he represents and who was - at least at the beginning of their match - levels above him. He probably would need a complete breakthrough to survive.
Or maybe it really isn't him lol