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Dallas Cowboys' Mike McCarthy: 'A challenge' when O-line is in flux again

FRISCO, Texas -- When Mike McCarthy was introduced as Dallas Cowboys coach on Jan. 8, 2020, Zack Martin and Travis Frederick were among the players in attendance inside Ford Center at The Star.

Their presence, as well as the presence of tackles Tyron Smith and La'el Collins, was a huge reason why McCarthy wanted the Cowboys job. Smith, Frederick and Martin had been All-Pros and seemingly were in their primes. Collins was an ascending player, coming off his best season in 2019.

McCarthy never saw them play a game together, and the offensive line has been mixed and matched more than some old-school Garanimals ever since.