Mark J. Rebilas-USA TODAY Sports

Starters: Anthony Castonzo, Jack Mewhort, Khaled Holmes, Todd Herremans, Gosder Cherilus

Reserves: Joe Reitz, Hugh Thornton, Ben Heenan, Jonotthan Harrison, Lance Louis, rookie draft pick

This is the most difficult grouping for me, given the vast amount of different combinations possible.

Just look at the starting lineup, for example.

Khaled Holmes will be competing for the starting center job with Jonotthan Harrison. Holmes won the job at the end of 2014, but Harrison has a higher ceiling. Herremans will be competing with third-year guard Hugh Thornton, with reserve guards Joe Reitz (an always-dependable option) and Lance Louis (less likely) fitting in the mix somewhere as well. Gosder Cherilus should be the starter at right tackle, but if he doesn't heal well from his offseason knee scope, who knows?

The back end is just as difficult to project. Former CFL lineman Ben Heenan may fit in there somewhere, but maybe not. There will probably be at least one or two draft picks in the rotation, and that may affect the starting lineup as well, but that's a complete question mark.

If they can get a group to stay somewhat healthy, the Colts offensive line will be fine.