Offensive Tackle (four)
Marcus Gilbert, Willie Colon, Mike Adams, Jonathan Scott
The starters are obvious, although Adams might make this interesting at some point. Jonathan Scott, as bad as he's been, has experience and is pretty durable. He's mostly harmless as a fourth tackle and probably won't dress much unless someone gets hurt ahead of him. Don't forget, Ramon Foster and Trai Essex can also play tackle.
Offensive Guard (four)
David DeCastro, Doug Legursky, Ramon Foster, Trai Essex
DeCastro should start from day one, although I'm not sure which side of the line he'll anchor. He might go on the right between two experienced guys. I'll take Legursky to win the other spot in a tough battle with Ramon Foster. Trai Essex, a versatile guy, sticks as a backup once again.
One? Yes. Trai Essex and Doug Legursky can play center. There's no need for an assigned backup when you have multiple guys who know how to do that job and have done it before. Pouncey will hopefully be durable enough to make it through the whole year, but if not, there's depth.