Facts.
I've been saying since last year that we cannot win against quality teams with Couch and Porter as our starting CBs. Fortunately, we grabbed Davante who leap-frogged them to start at one spot. Richard "may" be capable of being the other starter, but who knows. Damari may get there at some point this season, but if he does, it will most likely second half of schedule. And who starts when we need a fast nickel package with 3 CBs on the field at the same time? The rest are rotational as you say.
p.s., we have a similar problem at LB, where we'll be throwing freshman bodies at the wall to see who sticks.