It seems to matter if you go through the history of the NFL like Noll/Bradshaw, Landry/Staubach, Walsh/Montana etc. The only playoff loss by Cowher/Ben (29-11) was to Belichick/Brady (219-64) with wins over Dungy/Manning (85-27), Holmgren/Hasselbeck (58-45), Shanahan/Plummer (39-15). But then in the Tomlin/Ben (154-85) era there are losses to Jack Del Rio/Garrard (39-37), John Fox/Tebow (8-6), Marrone/Bortles (16-28), Stefanski/Mayfield (17-13). So who knows. Maybe you're right that the coach isn't important. Could just pick anyone I guess.