I understand the worry especially with the first part, but that isnt exactly apples to apples. Those people who left were already at the place and decided to leave, in this case Miller had his first chance to choose where he would go, and with all of his options it ended up being Buffalo. He may have second guessed it prior, but I do not see him waffling on it now (granted he wouldnt publicly anyway).
We will know the answer once the live bullets start flying, I am sure the rams opener may mess with him some, but then the next week the home opener against TN I think (maybe hope lol) that will validate his decision. Maybe even winning that first week would help more.