Well, we will see how AJ deals with Parker first. I think Haye in his prime was a better mover than Parker is now - but he is not in his prime is he?! If Parker gives AJ trouble then maybe Haye vs AJ could be an entertaining fight - on that same note tho - Wlad did provide the template for a big, powerful guy to beat Haye.
I think Joshua blows Parker out inside of 5 rounds.
I'm not saying that Parker can KO Joshua or anything, but do you honestly believe that Parker - who has never been hurt in his career let alone been dropped - is worse than Brezeale, Whyte or Takam (whom Parker beat by UD?)