I think it's a decent list, but with all due respect I feel there is some over analysis going on here
I've been around long enough to see teams(and fans) declare that a player should be cut, coach fired, etc. At times, it involves a once great player who is either getting up in age, or is playing at a tier 2 level. The problem with that is, it is not very easy to replace those players. In fact, some teams flat out sink after that
Take some of the players on your Tier 2 list, for example. Sherman, Bennett, Chancellor. How many players at their positions can you argue is better than them, on a great team? Probably a few. But you can easily argue they're top 10. I get our standards are high, but until this defense falls to the bottom half of the league, that kind of production doesn't grow on trees.
I honestly don't believe Seattle fans give Pete/John enough credit. They make some huge blunders, but from a league wide perspective they are top tier. They've put together a team that has been to the playoffs 5 years in a row. I look around the league, and I just don't see too many teams that are better talent wise. What you CAN argue is that other teams have better coaching. Then we can talk. But this team has elite hall of fame talent all over the defense and a top Qb. But I sincerely think we need better coaching on defense and offense