To add to what Theisey said he can line up anywhere and can run the ball all night. He can even run pass routes all he wants, but if he is downfield and a pass is thrown beyond the NZ to another player, we have ineligible player downfield foul. If the pass is thrown to him while he is downfield and he muffs or catches it, we have OPI.
By the way, only in the NFL can he report to the referee to become eligible for a play.
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