If he enrolled at UConn last year, the clock started.
If he enrolled as a full-time student at a junior college or at another four-year school, the clock started.
If he did not enroll as a full-time student at a two or four year school, his clock did not start. However, the NCAA allows only a one-year grace period after your high school class graduates and then the clock starts whether you enroll or not. So no matter what he did last year, his clock will start this September.
If he enrolled anywhere, he didn't play football, so the year in residence requirement is not effect. No worries there.
So...at worst, if Rose wants to attend UConn, he'll have his four years remaining. The only question is whether he has four or five years to play those four years.