I think it is important to point out a few facts that several are overlooking in this thread. First Braylon was doing well early on at RB, but he had health issues keep him out for a significant portion of the year. He wasn't playing because he wasn't as good or better than the other 2 frosh, but simply because he wasn't fit to play. By the time he was healthy again, he missed out on key development time that the other 2 got and hence his PT wasn't as much as those 2.
Second, as noted above, SJB hurt his knee right after the OSU game and missed time because of it. AG also started surging and solidified his spot across from AD. SJB still needs development as a CB, this Spring is huge for him, so losing out to someone who has been focusing solely on CB for the past 3 plus years isn't a knock on SJB's potential.
Finally, Braylon was heavily recruited as a CB in HS. Many schools wanted him on D ala Prince. Let him redshirt this year and get back to focusing on CB and he could be a stud there.