Every time they brought him in it was an uncomfortable situation according to Underhill. The players were willing to let it happen only because it was what was best for the team and it was a limited role. They were willing to try anything to fix the offense. I doubt they feel the same if they tried to name him head coach.
It doesn't matter if the accusations of racism are true or not because many players believe they are true. The last thing this organization needs right now is more controversy and trouble in the locker room.
And that ignores the fact that he hasn't been a good coach in many years and failed with the Raiders the last time he was their head coach.
Maybe they do bring in JG. But if they do, they should all be fired.