If his Dad is Christian Gardner, he will likely just get a slap on the wrist, and no record, because that's a lot of money that will come to bear.
Also, can you imagine how much of added scrutiny would come to bear on the University if the son of the Chairman of the Board of Trustees was discovered to be culprit here. Now, he can say, "I turned him in! We don't condone that kind of behavior at the U!" while quietly making sure that his son doesn't actually catch any real consequences for his actions.
If a 18-year old kid is yelling *FLIP* BYU while throwing a water bottle at the team, pretty sure a mission isn't in his immediate plans.
I would also find it highly unlikely that this kid is looking to serve in the military.