I agree that his inline blocking is good.
He is the worst pulling OL I have ever seen. The RB usually beats him to the hole or he is in the way and helps the defense make the tackle.
He is also fairly poor at the second level often lunging and falling because of poor footspeed.
The big plus that I see in him is that he seems to be a very good pass blocker from the film I have seen. When you combine those two skills that is not such a bad OG/C player but it'd be a mistake to ever try and run a screen with him or to ever try and pull him. He needs to be a Center or RG.
I hope when they drafted him they had him plugged in for that role.
Right now I hope he starts at RG, then Center can be a competition between Costa and Bern. Maybe we can keep Livings for a year at LG or alternatively in Bern wins at Center, maybe we can slide Costa to LG.
This guy is not who I want in the modern NFL horizontal passing game and blocking in space but if we want a guy to run behind and to protect Romo he seems okay.
I just wish we had traded back about 10 spots and then picked him while picking up another 3rd. I don't think he was a good value where he was picked because he has such a limited ceiling due to athleticism and marginal strength.