The Stones role is a midfielder who converts to a CB when we lose possession. It was very similar to what we were doing with a fullback but solved the problem of the fullback having to track all the way back to wide areas on a giveaway.
I don’t really see a scenario where we commonly would play Rice and Stones if we kept the same system as that would have Rice CB and Stones sliding out to RB as a defender. I suppose that probably works ok but we’d probably rather have Stones at CB in the defensive line than Rice
Having said all that last seasons final system may not be how we intend to play