Mike Shanahan changed the NFL.
And he’s still doing it (look at the coaches in the NFL right now who are from his tree. I believe it’s five).
But what he did for offense in the NFL is without question. People still talk about the zone running scheme that Alex Gibbs and Shanahan used with the Denver Broncos.
There’s also that little thing of winning back-to-back Super Bowls.
That alone should get Shanahan into the Pro Football Hall of Fame. And the old, “if he coached anywhere else, he would already be in.