Tomlins 1st camp was the toughest because he was the new guy and had to show all the players, even vets, who was running the show. He needed the guys to buy in to his philosophy and play his way, not the old way (Cowher's way).
He pretty much admitted that the team was pretty burned out by week 16, and that those tough summer days could have been the reason.
Coach knows what, and whos buttons to push by know. I'll trust his judgement.