I think he has progressed, not only as evidenced by the videos. My eyes tell me he has been hitting middle of the field throws more. He protects the ball better than ever.
Don't forget he now finally has his whole core of playmakers back.
It could be reasonable argued that our offense played well enough to win at least 10 games with adequate defense/ST. The Bills lost games this year scoring 31,31,25,25,24. And, gaining 589,425, 393, 382 and 376 yards. and having 30,30, 25, 25,24 First downs.
He is good and will get be better if we stick with him. It would be crazy to not keep him and replace him with the crap available.
I'm not saying he is Brady or Rodgers, but he is good enough to accomplish alot with.