Totally agree on your points as well.
I forgot where I heard it might have been PFF but it made sense. They said in order to beat the chiefs you have to be able to run the ball because Steve Spagnola calls a lot of coverages that can confuse even the best QB's so by being able to run the ball you limit the amount of times you have to face those exotic coverages. Im paraphrasing but that was the main point and I agree.