Colledge may be brought back, but I'm not sure we'll pay him what he could get elsewhere. Maybe. Lang/McDonald/Sherrod will likely compete for it. Some of the scouting reports on Sherrod suggest he could play LG. I'd rather give him some playing time, than have him ride the pine all year, especially if he's better than the other guys.
Ultimately, I think Mike will put the 5 best linemen out there, even if it means putting Bulaga at LG and Sherrod at RT, or vice versa.