I agree that Golson gives us MUCH more, but I think a senior Tommy Rees is just a different animal than sophmore Rees. The difference between feshman, sophmore, and junior Jimmy Clausen was pretty dramatic, I expect a scaled-down version of that progress. While he can clean up some technical problems, the biggest difference is simply that he'll be stronger, more confident, more expereinces, less timid, and the clear leader of the team. A few kids look like grown men at 18. A lot more catch up by the time they are 21 or 22.
That run in practice was the perfect example. He didn't look fast, he just looked decisive.