[BoomerSooner]

I'm not sure if there is a specific ruling at the college level regarding this issue so this is mostly Fed, but once you've stopped play you have a dead ball situation. Although the defense isn't allowed to call a time out during a live ball situation, once the ball becomes dead either team can call a time out. I think the prevailing thought is since the play has already been killed, the time out request can now be honored. As such subs would be allowed. Even if the time out weren't allowed, any subs that had properly reported should be allowed in during any dead ball period. As far as the 5th player issue goes, he isn't a player until he properly enters the game. As such he remains a sub and can't enter until properly beckoned. The question is how was the ball made live with only 4 on the court in the first place?