I expect we will keep 9 offensive line players on the 53-roster and 1 or 2 on the practice squad.
Clearly we will have Anthony Castonzo, Gosder Cherilus, Hugh Thornton, Donald Thomas (if not on IR) and Khaled Holmes. Jack Mewhort also seems obvious. DThomas or JMewhort might be the back-up center. That is six.
Three other veterans would include Xavier Nixon, Joe Reitz and Lance Louis. XNixon contributed last year as a rookie, after being undrafted and signed off of Washington’s practice squad. He played in the last 4 games, starting at guard against KC. He is probably best-suited to play tackle, and is considered by many a definite "high ceiling" young player. JReitz has been a starter for us in the past (3 games last year) but has been injured some. He missed two games in 2013 with a concussion and seven games in 2012 with concussion and knee problems. JReitz was brought back as a restricted free agent this year, and he adds versatility because he can play guard or tackle. LLouis was signed in January, he was a starter at guard for the Bears in 2012 but was injured late that year, and he did not play last year. He has been working with the Colts first team, with DThomas not participating in OTAs. In my opinion, these are probably the "safe picks" to be the nine to make the 53-roster.
Some other prospects include Thomas Austin (center, undrafted in 2010, promoted from the Colts PS late last year), Jack Breckner (tackle, undrafted in 2010, signed in February from arena league), new 7th round pick tackle Ulrick John and new undrafted FAs like center Jonotthan Harrison, guard Josh Walker, and guard Mel Hall.
I am quite optimistic about this group and I like our depth. Of course we need some 2nd year players to make a jump -- HThornton, KHolmes and XNixon. We do want our starters at guard and center to be better than last year.
Of course there is always a chance we will add someone new.
Otherwise if DThomas starts the year on the IR, then TAustin might make sense as an experienced back-up center.
It will be interesting to see which of the young prospects stand out, although they might end up on the practice squad.