Dan Jones is a better player, especially in the creative sense, but Carl Dickinson was a highly capable deputy. I suspect his wages were a bit high for someone playing a specialist cover position, and that Nolo will look for a younger back-up. Or indeed he may be planning a change of playing style requiring more wing-back types. Dicko was strictly a defender.
Would be a good signing for another League two club though. You only have to read his parting Tweet to conclude he's the really professional type.