I watched it too and he is incredible since he can just simply throw multiple power punches but not feel tired at all since he has a unique conditioning that makes his lungs capable of surviving until the last round without any sign of fatigue. The only thing they can do is knock him out or win via submission as soon as possible and they also need to be faster than him when they want to fight him because if they only rely on their power without speed, then that would only make them tired and the fight would be easily handled by Merab like his any other fight in the past.