You could make Callahan asst HC along with Robinson although that may be prohibited or make Robinson mad. You could make him passing coordinator and a big salary. Getting him here would be a plus but I'd rather have someone who could mix in the West Coast variant more or even some more Martz. Turner and Red are a good bit alike but there aren't many people who know enough to really answer that question with any authority.
Jason needs to mix things up more using our RBs like Martz, our WRs more like Walsh, and use Hanna and Witten more like Jason Garrett. Use Witten underneath and intermediate some and use Hanna more like Gates. He needs to vary the tempo of the game more and even occasionally use the hurry up and no huddle offense.
Did you know there are only 5000 Snow Leopards in the wild now and they are confined to Central Asia? However, the effective global population (those likely to reproduce) is less than half that number.