Sounds like you understand that looking at his peers will show that we outperformed reasonable expectations for a HoF QB that isn't in the conversation for being the GOAT.
I've done this before, and what it generally shows is:
- Ben won a lot throughout his career. Including under Tomlin. Probably at least as much as you'd expect when you compare to anyone but Brady and Mahomes.
- Ben has a higher INT% in the playoffs than his peers.
- Ben's increase in INT% in the playoffs is higher than his peers (it makes sense that INT% is higher in the playoffs than reg season, because you're only playing the best teams).
- This one is hardest to nail down, but I think Ben produced more magic than any QB I've ever seen (I agree that he was very special)
- The other edge on that sword, is that I think Ben's been responsible for more DTDs than his peers in the playoffs.
- Another one that's hard to know, but my guess is that Ben likely starts slower than his peers in the playoffs. IMO that was critical in the Jax game. Where we knew that the D was outmatched without 50. And we needed the O to start fast to take their running game away. Instead, we sucked on offense any time the game was within 2 scores (in both games that year).
It's also interesting that Ben could amass all of those accolades that you point out when almost all of his career was played under Tomlin. Especially when you look at the difference in his production under Tomlin and Cowher (Kenny threw considerably more than Ben did across their first two years...but Ben was amazing and Kenny isn't an NFL starter).
I think the reason that we didn't win more under Ben (even though we won as much or more than anyone but Brady and Mahomes) is because Ben is a high variance player. And the best way to win with a high variance player is to limit the number of plays they have and hope that you flip heads more than tails. This is exactly how Cowher played with Ben. But as he took up more and more of the cap%, you can't really justify not having him throw more and more.
Ultimately, I'll always be grateful that I got to watch all of Ben's career. I think you're right that he was one of a kind. And while he was maddeningly frustrating at times, I don't think I ever really felt out of a game when he was under center (even the debacle of the CLE game).