In some ways the kid should just come clean, just to stop all the speculation. If there was some sort of major criminal offense, I can only conclude that charges would be pending and that it would be well known what happened. So, based on that assumption, I would not want anyone to judge me too harshly on something I may have done as an 18-19 year old.
It's obvious that Coach Burton knows what happened, most likely there is some sort of double secret probation between Plinke, his parents and Burton. I'm sure he is on a very short leash. Once a school gets a reputation of letting bad people in to it's football program, it can be a tough one to off load. Burton has maintained all along that they are running a program built with good kids, and until I see differently, I will trust his judgement on this signee and assume that the kid was away from home, got involved with something that spiraled out of control and made some really bad decisions. Given that there are very few facts other than the expulsion to go on, I have to wonder if Burton was able to or did talk to the Boise coaching staff. I just don't know if that is even allowed. No doubt he talked to previous HS coaches and people that knew this kid. I just hope whatever happened is a blip on the timeline of this kids life, and that he learned a valuable lesson about consequences of your actions.