Furthermore, not to keep kissing Gray's ass, but I should also add that we almost really do have two head coaches on the team.
A big reason Wade and Gregg failed before us is because although they understood the defensive aspect of the game, they couldn't quite bring out anything offensively. The people they appointed to offensive coordinator were pretty lousy and none of them have really done anything since.
On the other hand, Gray is very similar to Wade and Gregg in terms of how well he understands that side of the ball. And I think he's probably going to be a HC pretty soon, I think he might have the same troubles that the other two had.
Not to mention, we have a lot of former NFL players as coaches, which I think is also pretty important and leads to players really buying into their speeches a lot more, since they've "been there."