you said peppers in his prime the fact you think bringing up the 07 season helps your arguement shows how shotty it is to begin with peppers from 04, 05, and 06 was probably the best defensive player in football I wouldn't even put keek top 5 right now much less #1.
Absolutely, WHEN peppers played, he was amazing....but the guy wasn't an every down player. Sure he had talent, yes he made amazing plays, and yes OC would poo themselves trying to game plan for him. But I do not believe that he made the impact on every down like Keek does.
Also, here is Peppers stats. I know 2007 was one year, but it was in the middle of his "prime"
Will say as others have said a Morgan v Keek or Beason V Keek would have made more sense