I'm going out on a limb here. The general consensus of this site is that Britt sucked so bad at Tackle that he was moved to Guard. That's really only the effect, not the cause. The cause was that our LG we trotted out was so terrible, that we had to move Britt over to LG to shore up the position, knowing we had Gilliam to take over at Tackle. There was also a glaring need to get Gilliam some game experience if he was going to replace Okung at LT. I personally think that the Hawks were never going to pay market rate for Okung.
The problem with this consensus is that it's patently wrong when held up to Cable's OL philosophy. Cable has never cared that much about pass blocking, only run blocking. Britt was one of the best run blocking RT's in the league his rookie year, although we all know he struggled at pass pro, that's not a knock in Cable's book. Also, both Cable and Schneider said that coming from Mizzou, Britt was going to need some seasoning after working in the exaggerated splits that OLmen have to in the college spread. I honestly haven't seen any team give up on a Tackle after his rookie year. Hell even Cleveland doesn't run things that way.
I think that Webb could be a swing RT, but he's not slotted to start there. If he had shown a glimmer anywhere, he would've been sought after at RT. Look at FA and the draft; it's needed, it's shallow and teams know this. I theorize that Webb, Sokoli, Sowell, and Glowinski (and mayble Poole) are going to compete at Guard. Britt slides back to RT. We're also going to see a Center drafted, and Sokoli and Lewis will also compete with him at Center.
The other theory is that Sowell is our new RT. I haven't seen Sowell, but they didn't pay him like they thought he was the answer at the starting RT spot. I'm guessing they think Britt can improve and be an average to decent RT.