Ruy Exchange--Why not 4...bxc6?

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kindaspongey
kindaspongey wrote:

… "No one plays 4...bxc6?, since after 5 0-0 d6 6 d4 White is a whole tempo up on the Steinitz Deferred [(1 e4 e5 2 Nf3 Nc6 3 Bb5 a6 4 Ba4 d6 5 Bxc6+ bxc6 6 d4)]." - IM Sam Collins (2005)