was closest to the shooter got the "rebound" but as soon as he entered the key and got the rebound, the play was blown dead.

I think, that if pope when realizing it would be going to the possession had argued it, the possession arrow would have stayed with BYU and BYU would have gotten the ball.

per rule book:
"After an inadvertent whistle, play shall be resumed by the team in control at a designated spot nearest to where the game stoppage occurred using the procedures in Rule 7-3.2. If there is no team control, the alternating-possession arrow should be used to determine possession"

Only thing the refs could say is there was no team in control, but Spencer Johnson had clear control of the ball. Unless the whistle was before he was touching the ball.