It's the Lead's primary but W21 steps into the L's view of the play at the time of impact, so I'll give him the benefit of the doubt that he didn't want to guess. Once the Lead does not blow, The Center and the Trail both have open looks with the Center being next in line to put a whistle on the play, which he does. If the Center doesn't blow, the Trail also has a great look at the defender's forward movement.
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A-hole formerly known as BNR
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