Who was the imposter Kane at vengeance?

It is either Festus or Undertaker. I have some proof that it can be either one.

Kane has one sleeve , imposter Kane has 2 sleeves, to hide Festus' tattoo on his arm. Or it can be Undertaker, Kane is taller than Festus, but Undertaker is the same size. And he knows his moves because he is Kane's brother.