Both are true freshmen, and while highly rated compared to players that BYU has recruited in the past (4*, IIRC), the Big 12 is full of that kind of player but with 2-3 years of experience, and it sometimes takes time for a true freshman to adjust to that level of play. I hope both come in and tear it up, but it wouldn't surprise me if one or both take some time and aren't ready to play even 15 productive minutes in conference games.
Basically, I still think there is room for a veteran transfer or two.