I'm not sure Cowher is a good fit for this team.
Cowher strikes me as the kind of guy that would want to come into a situation and put his print everywhere -- not inherit a team on the cusp and win with someone else's players.
For instance, I don't see him wanting to deal with Owens, might want bigger linemen/linebackers for his 3-4, want "his" coaches across the board, etc. I don't think we're in a situation where we want a new voice coming in and taking a hatchet to aspects of this team. And I don't see Cowher being the type of coach that would accept Jerry saying, "Here, go win with these players," and doing it without objection.
As an aside, I think this team is built to hand over to Garrett. We don't really have another head-coaching candidate, and as I said above, I don't think we're built to bring in an outside voice who would want to come in and overhaul some aspects. The questions remains, obviously, is Garrett fit to be Wade's successor if we deem he needs to go?