Sub not in game for disqualified player

[Smitty]

This has little to do with the OP but what level of basketball was this? I'm just curious.

Maybe I missed it, but perhaps the referee only notified the coach and not the player that he had 5 fouls. Every time I have notified a player that they have 5 fouls after notifying the coach and then getting the 20 seconds started, the player leaves the court on their own. If the player did not realize it was their 5th foul, perhaps that's why they came back on the floor. I'm not justifying anything - just might be a reason why he stayed on the court.