It's amazing to me how little attention is paid to offensive line chemistry by NFL general managers -- considering it's arguably the single most important element of building an offense.
Well the point being is that if you have a good OL Coach, you won’t have to overpay for Offensive Lineman, because the coach can simply teach the new players.
Offensive Line play is more about footwork, than anything. That can be taught. Then it’s all about cohesion, and that’s what a good OL coach can do.