Brandon Lee Gowton breakdown of replacements on the roster
tl;dr. Matt Pryor is probably the frontrunner, he got some snaps last year and didn't look terrible. His play is a big drop off from Brooks', though. He has good size, but not nearly as athletic as Brooks, which should hurt the run game more than the passing game. Will most likely be a competition between him, Sua Opeta and Nate Herbig.
When there are already questions as to how well Dillard is going to do at LT, this really hurts. Even if Pryor is serviceable, it kills our depth all along the line before the season even starts. I really hope they sign Peters back, just for more experienced bodies- I don't think they'd even consider him or Dillard at RG.