This is a good get. He was Offensive Coordinator for two years in Chicago, he was interim HC for 6 games in NO, he was OL/run game coordinator for 3 years with the Rams. This is that experienced guy on the offensive staff that's been missing. He's used to digesting film early in the week and figuring out what run plays to install against a particular opponent, like Scarnecchia did for New England.
Happy for McDermott and proud of him for going outside his comfort zone.