Remain the same - A year or two ago, I think I would have a different answer. I just think the Bills roster lacks the overall talent for a coach swap to make a huge difference
Bills gap increases - I think Josh Allen would do wonders being on the Chiefs with that team and coaching staff. Arm talent is a push, so I base this on running ability Allen >>>> Mahomes.
Bills close the gap - Again, I think the Chiefs have a better roster, especially on the o-line and defense overall. Skill position is probably equal, could make a case to favor one side slightly more.