A lot of guys who just committed after being wowed to start, but then later decide they want to see what else is out there. Guys who may not realize how big they really are/will become as a recruit. I don't get that because every recruit should work and believe like they're capable of big time offers... But it's teenagers, so anything is possible.
There's just so many options out there, it wouldn't kill BYU if one or both of them did. They do love BYU but we'll see what happens. SOOO many options though if they do. They'll have many to choose from. Hopefully they work hard to keep who they have, because a lot of current commits are going to be very very good and sought after.