Mark Davis hired a man off the teevee, again. Mike Mayock, who has never worked in an NFL front office but has worked for NFL Network since 2004, will be the next GM of the Oakland(?) Raiders, according to ESPN. He replaces Reggie McKenzie, who was fired earlier this month because the Raiders’ grand plan has always been to give Jon Gruden pretty much unlimited power. “He loves it,” Gruden said.