Just adding a little perspective here for our forum users...
Matt really wanted to bring in an older, experienced mind to the offensive room to help mentor all of the young coaches on that side of the ball. That's what this hire is about. McCall is a guy Campbell credits much his success to and thinks he can help be that to many of the guys on that side of the staff room. He won't be the OC but he's a guy that Manning will have at his disposal to bounce things off of 24/7.
Goes pretty deep here. I love the hire.
Works for Freddie Hoiberg. He has at least one or two older head coaches on his staff at all times.