I totally agree with you. I'm not convinced Cowher is that great of a coach. He had a structure that was second to none in Pitt, with a future HOF DC in LeBeau (remember what he did in 2004 for us, pretty awesome for one year), a great OC in Whisehut, great OL coach in Grimm. That was a terrific staff.
Contrast that with Marty, who has worked in various scenarios with many different types of people on staff. I'd be far more excited by Marty than Cowher. Of course, Shanahan is the holy grail for me, but I'd be very happy if we played Marty-ball should Shanahan decide to go elsewhere.