Nice problem to debate...
On the surface, I would love to get a Folston commit and see him come in and play CB alongside Luke. The only problem with that is, it takes a big time prospect off of the field for a lot of snaps, because Russell is going to be a star for three more years. Now you're talking about Luke and Folston competing for the other starting spot once B.Jackson is gone. Whoever wins, the other could play nickel, sure, but that leaves another hybrid-type member of the secondary off the field.
For example, it could be Shumate. With Collinsworth for potentially two more years, along with Farley and Barratti, there is a log jam of talent in the secondary.
The easiest answer is to leave Folston on offense, and let a guy like Kinlaw or Butler develop into talented corners like the original plan. In the nickel, one of your four talented safties can come in (like Shumate now), and in a dime situation we've seen Spond take some reps as basically a fourth CB, so the number of bodies only grows. You can put Spond in that 4th spot like he has been, or put a fourth safety on the field, or let one of the younger corners take the reps. You could even let Davonte Neal play defense in the dime.
With this, Kinlaw and Butler have time to develop, provide quality depth, and contribute on special teams while Folston focuses on offense and forms a dynamic duo with Bryant down the road.