We're also not talking about RBs here. We're talking about a QB. That's a very different position, with very different kinds of pressures and responsibilities. Kurt did not just come back on a "very talented offense." Yes they have talent that is undeniable, but he took charge of that locker room. He became a leader again. That's what was lacking in his down years. Now that he has gained the respect and of his players, their talent was allowed to shine. He did not just come back and have a good year stats wise. He came out and made every player on his team better.
Kurt is a HOF QB. The reason is because he did was QBs are suppose to do. They are supposed to lead their team, and make every player want to be better and want to work harder. The other QBs in the league that have done this in the last 10 years are Tom Brady and Peyton Manning. Now don't get me wrong, I'm talking about leadership, not stats. But again, the 3 best QB leaders we've seen in the last decade, motivators for their teams, have been these 3 QBs.