Why six pages? Because the OL is the most important unit on the field for 50% of the game...
Best case scenario, you never think about the OL coach... means the line has been playing well, for the most part... Over the last few years though, we have had a cast of characters in the role who weren't up to the task... and as a result, the line play has fallen off significantly... why? talent, injury, scheme, coaching, for whatever reason... the coach is the first part of the puzzle you can fix... hence you get six pages on the OL coach...