Boxing is fought on such razor thin lines, especially at heavyweight, that it is hard to deny that AJ has a chance. He's got power and he is therefore a threat to Fury. But that is as far as I go.
Fury might not be a big hitter, but he'll be a test that Joshua has never faced. He's awkward, he's got a great defence and he'll match him up for size. No doubt, Fury is the better and more technically gifted fighter.
The next problem for AJ is threefold.
One, Fury has shown in his last fight that, when he wants to, he can come and fight on the front foot and beat a very dangerous opponent down.
Two, AJ to me, looks gun-shy. I might be wrong, but I feel like that loss vs Ruiz has brought him back down to the reality of heavyweight boxing and he's mentally trying to find himself again. I can only imagine the questions he will be asking himself inside about Fury, no matter what sort of front he is putting on.
And lastly, he's still not a boxer. The commentators and posters on here say he has shown he can box, but I disagree. Especially at the top level. I watch him try to fight on the back foot and it reminds me of sparring/training with other amateurs. Basic movements with no afterthought, no disguise, no feints, no variety, upright stiff stance etc etc. You pretty much know what you get with AJ and a really smart boxer in Fury will have him figured out. He'll time him well and catch him, he's just too predictable and is there to be hit. His defence is severely average and his chin is under question too. You talk about Fury's chin, but only one of them has ever been stopped. And that was by a Ruiz that has 22/33 KO rate, which I'd say is fairly average.
I think the Klitschko fights tell the tale of this fight. AJ got dragged into a war and knocked down by and ageing fighter, whilst Fury just took him to school and it was never a contest.