Joe Gibbs coaching tree?

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Last week on the Riggo show he was talking about Walsh and how people call him a master mind of the game (I think that was the term or something like that) and how they just call Gribbs a great coach. He then started given out stats of the two coaches careers and how Gibbs numbers are better in just about every category. He was not knocking Walshes great career but only asking why Gibbs is only considered great and Walsh a master mind.