Why do you think Nat Dorsey is still available?
Because teams know that he is very raw, and he has not improved any since his freshman season. There is an upside there, but he is far from ready to start as a rookie. Miami was looking to get someone that could compete for a starting job now. When looking at the tackles, you have Robert Gallery who is a man child that will line up as the starting left tackle for Oakland next week during their mini camp. There was no questions about him, and there was no chance Miami was going to get. Then you have Shawn Andrews and Vernon Carey, who were pretty much in the same group. Both were a pretty significant drop off from Gallery. Both have question marks about their weith and conditioning. Both are massive, strong, and powerful run blockers who are very good athletes for their size. Both are better off at tackle than at guard, IMO. There really is not much that separates the two if you base your evaluation of Carey off his junior season when he played right tackle for Miami.
After those two, there is a dramatic fall off in the talent availble at the tackle spot. Jacob Rogers was the next tackle picked, and he didn't go off the board till the late second round. Jacob Rogers is a guy who is a pretty good athlete, but he has durability issues and lacks overall strength. He looks like a future swing tackle to me that is good enough to back up both tackle spots but isn't good enough to be a starter at either spot.
Max Starks was the only other tackle taken on day 1. He's got great size, but he is clearly a finess tackle that isn't very good as a run blocker. He's a developmental prospect.
Then you drop to Nat Dorsey and Kelly Butler who are still available. Both are juniors that should have stayed in school.