Man you need to do your research better . Harbaugh was a HC at Stanford for 4 yrs before he went to SF. And Tomlin was DC for the Vikings before he went to the Steelers . Yeah it's about finding the right guy but you can't tell if he WILL be the right guy until you see him succeed at a OC or DC position of having control of one side of the ball for at least 1 season , 2 or more is better. AND being in control of those position not being an OC in name only