With the defensive coordinator role, the other most important spot on his staff, Mayo was surprisingly decisive. Even though Steve Belichick, Bill’s son, had been the Patriots’ defensive play caller in recent years while they routinely boasted top-10 units, Mayo didn’t offer him the chance to continue calling plays, according to a team source, opting instead for young defensive line coach DeMarcus Covington. Mayo offered Steve a lesser role, but the younger Belichick declined and left to become the defensive coordinator at the University of Washington