Re: 4th and short...
Forgive my somewhat jaundiced eye, but we'll see how aggressive Coach (or Arians, assuming Tomlin means what he says about letting them do their jobs) is on a 4th and short against, say, Baltimore or New England, if we're trailing in the game. Go for it there, and that's impressive.
We had the Browns in hand from our very first possession. Going for it on fourth down was a much easier decision and it twisted the knife a little, which is always nice. I'm glad they did it too, but still.