I was wishing for this match up because I'm confident BYU would beat Utah given the state of the two teams.
I've read the PAC-12 permits teams to go to a different bowl instead of accepting a bid to the same bowl 2 years in a row. We all know the Utes have a weird fear of playing BYU so even if they were selected by the Vegas Bowl, Utah would say no.
Additionally, Utah could make the game happen if it wanted by pushing the PAC-12 and bowl executives to have Utah available for Vegas.
It's another instance of Utah avoiding a game with BYU.