I think Cowher would come here squarely because of the greatness he can achieve career-wise:
Rebuild and create an elite team to a once prestigious franchise.
In turn, doing what pass coaches failed to do, and placing himself clearly above them (namely JJ).
Compete against Belicheck, who of the few coaches to have a winning record versus him in the playoffs, regain dominant form and become division champions many times over his tenure.
Cowher's challenge to win a superbowl with a 2nd team would be quite a historic feat. What better team to achieve it with, than one which achieved something no other team has done (perfect season).
Rebuild and create an elite team to a once prestigious franchise.
In turn, doing what pass coaches failed to do, and placing himself clearly above them (namely JJ).
Compete against Belicheck, who of the few coaches to have a winning record versus him in the playoffs, regain dominant form and become division champions many times over his tenure.
Cowher's challenge to win a superbowl with a 2nd team would be quite a historic feat. What better team to achieve it with, than one which achieved something no other team has done (perfect season).