Stack on throw-in

[Adam]

Originally Posted by BillyMac

Let's go to the videotape:

THROW-IN ADMINISTRATION 7-6-5: Teammates shall not occupy adjacent positions which are parallel
to and within 3 feet of the boundary line if an opponent desires one of the positions.

7.6.5 SITUATION: Prior to a throw-in on the end line near A’s basket, A1, A2
and A3 line up shoulder-to-shoulder parallel to the line and: (a) within 3 feet of it;
or (b) more than 3 feet from it. In both cases, Team B requests space between
the Team A players. RULING: In (a), the request is granted and a Team B player
may position between each of the Team A players. In (b), the request is denied.

Not to be confused with:

JUMP-BALL ADMINISTRATION 6-3-3: Teammates may not occupy adjacent positions around the center
restraining circle if an opponent indicates a desire for one of these positions before the referee is ready to toss the ball.

Billy, he wasn't talking about parallel positions, so there is no rule (which means what he's doing isn't supported by rule).