Callahan was my first choice. But Philbin is a great OL coach hire. Green Bay was committed to the run game during the early McCarthy era and had success with a notable 201 yard rushing performance vs Seattle in 2007 in a play victory by Ryan Grant. He road a running game to his Super Bowl championship. He was the coach when they drafted Aaron Jones and Jamal Williams who without their running and catching this year, Green Bay would not be 13-3 with a bye week. Ryan Grant, Ahman Green went for over 1K, and Edgar Bennett was his RB coach and Offensive Coordinator late in his Packer tenure.
If McCarthy learned anything during his time off watching cut ups and building his analytics of play calling, it is to run the ball and feed the running back with touches. That is what he did not do during his last years as Packers HC. Forgetting the run game got him fired.