I think it will be the deciding factor in his rematch against Andy Ruiz. I don't agree with those people that say Joshua has a glass jaw - he got up after Wlad's mosnter right hand, he was hurt but stayed on his feet after getting hit by an awesome left hook form Dillian Whyte. Wlad and Whyte along with Wilder are three hardest punchers (I mean proven punchers) in the HW division in the last decade. And even against Ruiz he got hit a lot of times, went down 4 times but always got up quickly. His stamina looks like a much bigger problem in my opinion. I think it would be fair to say AJ quit against Ruiz, but not because he was scared of getting hurt, but because he knew he had nothing left in his gas tank. I know AJ reduced some muscles and it should help, but will it be enough for him to keep active through all 12 rounds since he needs to move a lot and work with his jab a lot? I'm not sure at all. AJ doesn't have great natural gas tank like say Riddick Bowe had. I know Wlad and Lennox (to the lesser extent) also didn't have great gas tanks, if we are talking about big heavyweights. But Wlad and Lennox had better defensive skills, better reflexes and also knew how to negtect opponents work in clinches. When they fought shorter guys they both used tons of clinches and their opponents were tired in the middle rounds because of their holding. AJ is nowhere near as effective in clinches as Wlad or Lennox were and I don't think he could teach that skill (yes, it's part of boxing skills, ugly part but still) in one training camp. So, it will be very hard task for AJ and his team to beat Ruiz. He can't just come and try to take him out early because Ruiz has superior skills and much quicker hands and will likely catch him again if AJ tries to take him out early. And if AJ tries to box and move and be very cautious (like he was against Parker), he will likely tire in 8-10 rounds. I hope AJ wins, but I think it's a hard task for him.
