I'm probably in the minority that believes Kosta could give JCC absolute hell. Kosta was a absolute freak, physically. Supposedly he bench pressed something like 350 pounds in the gym, among other things. He showed that physical strength against JCC when they did fight, man handling him like a rag doll. Kosta showed the ability to push JCC away casually, which is exactly what you need to do, get his head off your chest and not let him grind you down on the inside. And if Kosta COULD keep it at a distance, JCC is in trouble. No one at 140 is taking sustained pin point shots from a puncher like Kosta without something happening. I'd probably favor JCC, but it's a damned hard fight for him.