1. Mag
2. Crawford
3. Demin
4. Keita
5. Koz
6. Stewart
Based on our roster today Mag likely starts at the 4 and plays a lot of minutes there due to lack of depth at that position. Koz likely backs him up but gets considerably less minutes. Mag's defensive versatility will make it hard to keep him off the floor.
Crawford gives us a 2nd PG that is crafty, has a high IQ, can score at all 3 levels and is a really good shooter who plays with a chip on his shoulder. Like Richie did last year, I think he makes it hard for coaches to keep him on the bench for long. We'll see him, Hall and Baker rotate a lot with two of them playing as dual PGs together on the floor as the year progresses.
Demin will fill that niche in the offense that SJ did last year and put a lot of pressure on defenses inbetween the 3pt line and the paint. Because coaches want to max their rep at BYU as a program who can develop NBA talent, he'll get every chance to enhance and showcase his talent. The one thing imo that will keep him from being #1 on this list is how physical the Big12 is. I think he'll struggle with that.
Keita has been over-hyped a little. He's a good role player who can rebound and defend and get you a dunk or two a game rolling to the rim but his impact will be limited by his lack of an offensive skill set and his penchant for foul trouble (which will limit his minutes). He will split minutes at the 5 with Fouss and combined with the foul issues means reduced minutes and less opportunity to impact the game. He'll be good in his role as a tough defensive specialist though.
Stewart will get a few minutes as the 3rd string emergency 5 man unless BYU finds a better option (maybe overseas).