I never trust the clock; therefore, my LJ (4-man) keeps the clock all game.
In the situation mentioned I would direct my LJ to become the official clock. If his clock expires before the snap he would blow the whistle.
My personal opinion it is better to confront the possibility than deal with the mistake. When the clock failed to start someone on the coaching staff noticed. After the play went the coach who was harmed by the clock would have lost his hearing and no matter what you say, he would not hear.
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