That's true, but he was still top of the market when he signed. Most free agents get much more on the open market, since there are few elite or even really good players to hit free agency any given year. My point still stands. He was as "big time" as usually hit the open market.
If the OP was only referring to multiple All-Pro awarded, multiple super bowl rings, still in their prime, hitting the open market-yeah I guess you have a point. I take it as, whoever hits the open market gets a top dollar contract, and still has at least one magical season with the team that paid so much.