Before the portal and NIL, Larranaga built several good teams with transfers. Now everybody's doing it. The competition is tough when you are trying to get a transfer to come to Miami when blue blood schools like UK or Duke not only want them but want to pay them big bucks.
Similar to the problem that faced Roy. Roy was great at getting good HS players who were not OAD. Kids who had plenty of upside, but needed a couple years of coaching and development. But with the portal (and even worse with NIL), those kids don't stick around to pay back the schools that developed them.