After the final shift and before the snap, the entire team needs to be set. If the 11th player is still running to his position at the snap, we have an illegal shift because he never came set.
If the 11th player comes just onto the field, stops for a second, and then runs toward his position, we probably still have a flag for illegal procedure for not being within 15 yards of the ball. (Remotely possible that he's OK if the ball is on the near hash.)
If the guy runs to within 15 yards of the ball, stops for a second, and then continues to his position, and he's not moving towards the line at the snap, then we have legal motion and no flag. Even if he ran towards the LOS (before or after setting), as long as he's not going forward at the snap, he's ok.
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