I agree with the principles you describe (try to get better position to secure the rebound), but I saw things differently last year and respectfully disagree. It's true that if Haas is between his man and the basket, his position will make the shot tougher. While I love Haas, I think he lacks the ability to change directions laterally once he starts going in one direction. That's probably the biggest thing that holds him back from being NBA material because his skill level is above average. Not hating, few guys his size can (Shaq). It's really difficult to recover as he's just so massive. For a 7 footer, opponents had a lot of easy looks at the rim because of it. So many times, a guy quick 6'7" could give him a head fake or 2 and would get an easy opportunity.
Haas is also a guy that won't get many rebounds out of his zone. I thought AJ had excellent lateral movement and was above average to react/jump to get rebounds out of his zone.