From what little I've watched of O'Callghan, I don't see him as an upgrade in pass protection - early days there, I'm confident he'll improve his foot speed and technique working with Scarneccia, Woicik, and Nash, but that will be incremental over the season, any huge jumps will come in the off-season program.
He has the tools to be an upgrade as a run blocker, since BB is building a team that appears to be strong on the run this season, O'Callaghan will get plenty of reps and have a chance to take the starting job. I predict Gorin will start at RT against Buffalo, O'Callaghan will get in some RT work for a couple series, the same way Kaczur was getting time last year.
After Light, Gorin, and Kaczur, the tackles are O'Callaghan, Britt, and Hand. Britt is on the bubble and may be headed back to the practice squad. Of course, the ideal would be for Pioli to find another Ashworth after cutdowns start, which may put Britt on the shadow roster.
Whether we use Gorin alongside Neal, or O'Callaghan, the reality is that both sides of the line are pretty impressive with the RB group we have ready to run behind them.
