He's a thought which many may not want to consider or address. Maybe whatever he does he simply won't be as good as Mahomes. He's good enough to win a Superbowl - worse QBs than Josh have won Superbowls - but perhaps the Bills do just have the number two (at most). And no matter how much criticism is flung at him, no matter how many times he drives his body into the ground, that won't change.
That, and he played against a much better defense that Mahomes. Allowing an average rating of 123 when his play off average is 'only' 105 speaks volumes.