Umm, YES you can. Where've you been? Scholarships are renewable annually, nobody's guaranteed a four year ride. And coaches do it all the time. Every year plenty of kids get told to move on so that a scholly spot will be available for a freshman recruit. This is nothing new.
And, regardless, the fact remains: simple math tells us several must leave. The rules only allow 13 scholly spots. We're maxed out. We've promised spots to 5 new recruits. You don't see the obvious problem here?