Illegal substitution?

[johnsonboys03]

Originally Posted by BillyMac

Hold onto your horses BillyMac.

Does the substitute become a player when he's beckoned, or when he enters the court?

Does the original post state that A6 entered the court? I don't think so.

3-3-3: A substitute becomes a player when he/she legally enters the court.
If entry is not legal, the substitute becomes a player when the ball becomes live.
A player becomes bench personnel after his/her substitute becomes a player or
after notification of the coach following his/her disqualification.

Your question is the argument. What makes it a legal entry. Because if the beckoning doesn't do it in this situation, then technically they would have to check in again before the 15 second horn. Even then if you would check in before the horn can the coach resend that sub and leave the original player in the game?