Did you read anything I said? I stated that he wasn't THE BEST coach ever. Is he one of the great NFL coaches, yeah, but the best? No.
I know what you said, I am just responding that the argument is more up for debate than "hell no". His achievements stand up there with anyone all time. I don't believe Knoll, Seifert, or Shula are the best ever but I think you can make the argument with any of them.