First I've heard of this. I kinda wondered since the team may slip down the hierarchy of elite teams for a bit during the rebuild. I mean, I don't know if Super Bowl is in the cards if this offseason is as roster churning as some people think.
So if Pete retires, the next in line is Tom Cable since he's the Offensive Line Coach/Assisstant Head Coach. (Right?) I would love to keep this Pete Carroll system but I don't know if I'd be overjoyed with any coach on the team taking over as head coach.