And my personal opinion is that Staley could very much be worth the #9 pick. At least, I rate him as worthy of that pick as Joe Thomas.
There are as many unknowns about both guys, in my opinion, as far as their transition to the LT position goes.
The things you have to like about Staley that make him worthy of the #9 pick:
1. The quickest feet on an offensive line to come out in decades, possibly EVER. One longtime scout openly said he's never seen an offensive lineman have a workout like him.
2. Long arms, ideal at 34.5 inches.
3. Interviews are reported to be fantastic, for months now. It is impossible to overstate how important this is to an OL. No offensive lineman is good enough when he comes out to be top tier in the NFL. None. They all have a physical and mental learning curve. The guys that impress the heck out of you in interviews tend to be the guys that can ascend those learning curves.
4. On tape he's a natural zone blocker.
5. His upper body is strong, it isn't weak. It is the weakest part of his game on a relative basis but that doesn't make it weak on an absolute basis.
6. He's shown the ability to gain weight in the gym through diet and exercise from about 235 pounds to 305 pounds without losing speed or explosion. Again, it is impossible to overstate the importance of this. At 305 pounds, this is not the guy you want on the blind side. The same goes for Tony Ugoh at 301 pounds. The same may even be true of Joe Thomas at 311 pounds. It is certainly true of guys like James Marten (6'8", 309 lbs), Adam Koets (6'5", 298 lbs), Dane Uperesa (6'5", 309 lbs), etc. The only tackles that really might already be at the appropriate weight are Doug Free (6'6", 324 lbs) and Levi Brown (6'6", 323 lbs). So when you're projecting weight gain, you have to realize a lot of these guys are going to gain weight and lose speed on an average level, which will make them unattractive as pro NFL offensive tackles. The ones that are MOST LIKELY to be able to do it are going to be the ones that have a history showing a marked ability to do so. In Staley's case, the dramatic weight gain while not only not losing speed, but he may have actually GAINED some speed...what it shows is commitment to excellence. That is your primary conclusion. Work like that shows a tremendous work ethic, a willingness to sacrifice in the short run for long run gains. It is part of the reason he has been so impressive in interviews.
Basically we've not seen the best of Joe Staley yet, and yet what he has already shown in terms of his wide base, incredibly disciplined pad level, his power and especially his feet...are already NFL caliber. The NFL has every reason to believe that Joe Staley will get better....and that isn't always true about every prospect. That is what puts him over the top as worthy of a top 10 pick.
And that is why I do not believe anyone is getting ahead of themselves if they think Miami could draft him at #9.