Derek Carr is still top ten in QBR this season per ESPN

:unsure: I had the same thought process, but indeed that second tier is fairly large these days, when you consider the top tier isn't as large as it once was.

Allen would indeed be near the top of the list of names on it, whereas Carr would be down the line. Unless and until Allen's Bills can somehow overcome the Chiefs in a playoff game, he'll remain second tier.
Thanks for the reply. I was curious of the thought behind the statement.

I don’t necessarily think Allen should bee in the same tier as Mahomes and one or two more, but he’s in a different tier than Herbert, who might be in a different tier than Carr, because he’s younger with more room to grow.