Actually, most people would've traded Yao for Griffin if Yao was in his rookie years. Many considered Yao a bust early on. The only thing that would've stopped the trade is the mass income the Rockets receive from Chinese fans. The real question is who will be the better player in their prime. Yao developed into a dominant post centre who many considered to be the best centre in the league on several occasions. We'll see how far Griffin goes. An early knee injury is not a good sign for your athletism in the near future.
I don't disagree that Wall will be good. I just don't think he's going to be as good as some say he will be AKA a "stud right away". Yes, he has size, speed, work ethic and smarts but it usually takes point guards some time to get accustomed to the league and learn the position at the pro level. Also, I'm curious to see how Wall reacts to adversity and struggles. He had some character issues in college and his Wizards team is going to be attrocious. How's he going to react when he faces challenges and when his team is not winning all the time? Griffin on the other hand, while his injury history can't be ignored I think it's a little far-fetched for him to pick up an injury-prone label. The guy is only 21 years old and I'd be willing to bet he hasn't lost any athleticism from his setback. He's also 6'10 and 250+ pounds. How exactly is he undersized? Furthermore, he plays bigger than he really is. I think Griffin will have a better pro career than Wall and I also think Griffin has a chance to be one of the top PF's of all time with the likes of Duncan, Garnett, Malone, Barkley etc.
This is probably not even worth posting, but it's interesting: strong rumors in Cali sports radio that Baron Davis has been spotted and confirmed as significantly overweight this offseason. We'll see.