Why it's so hard to imagine Joshua beating Tyson?
I do think that Joshua's stamina issues and lack of jab would be an issue. Meaning that Tyson would eventually get up close, where AJ would have no tools to protect himself from the body shots.
I remember this scene in round 5 against Wladimir when AJ exploded and beat him down, but with Tysons upper body movement and height, it's questionable we would ever see that.