The Bills improved IMMENSELY if for no other reason than jettisoning TD and seeing Mularkey leave (and join the Dols ). TD had 5 years and the Bills never made the playoffs so his time was up, and hearing the players talk about the lack of leadership by MM, not to mention learning that HE was the OC for most of last season, made me realize what a dud HE was.
And I agree that shoring-up the OL with guys like Fowler, Reyes, and Royal were good moves, and replacing Adams with Tripplett was another good move.