Only way I can see it being Callahan is if Dallas told him it's bringing in a coordinator and he refused to be "just" a line coach.
He wasn't given much to work with this year and got the line to improve as the year progressed.
yes he did i was happy with both Callahan and Rob, both didnt have much to work with and did well with what they had to work with. and before i read the Rob Ryan thread, i would add Rob would be drooling to get Carter and Lee back. And if Callahan was giving more reign he would do good things as well.