Its just my opinion. I understand the experience Klitchko brings but I just can't see it happening. And certainly AJ knows his weight and has put in place the conditioning needed to carry him in case he has to go the distance. Yes it may not be as good as the real thing, but its not a massive disadvantage.
Wlad advantages - his lost before and knows how to come back, he has tones of experience, he has gone the distance many times etc.
Disadvantages - his getting old and not as much stamina as he use to. Not much negatives really.
AJ advantages - his got the power and speed factor, his got age which normal comes with stamina, and I don't his build will impact it greatly.
Disadvantages - some will say age because he doesn't have experience (maybe) he hasn't gone the distance before.
Not much for me that's why its difficult to call this fight. Then there is also the will to win. As Wlad has said, he is obsessed about winning his title (s) back, whether the body can match the will, time will tell.
For AJ, he has many years before him and while it will be a dream for him to continue unbeaten throughout his boxing career, which not many have done, even if he loses he has plenty in him to dominate the heavyweight division, but it will certainly play on his mind losing to Wlad.
Anyway, I just hope it will be a fiery fight with lots of action, whoever the winner I will be happy and sad