"We haven't made a decision on that," Garrett said, according to ESPNDallas.com.
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Garrett was criticized last season for clock-management problems and a lack of commitment to the running game. Keeping the mystery alive could speak to Garrett's reluctance to relinquish play-calling responsibilties, which he's handled for the past seven seasons in Big D.
That, or a decision has already been made for him and Garrett isn't in the mood to talk about it all summer. Can't say we'd blame him.