I can see where Ned is accustomed to installing that conductor, but in all probability it is not needed with the 200 amp base as the neutral is most likely already bonded. In either event a chase nipple should be acceptable with bonding at one end of the conduit.This explains it to me.
Around here (Wilmington, NC) the PoCo supplies the CT cabinet but the EC is responsible for bonding the CT cabinet. The AHJs allow a jumper from the neutral inside the CT cabinet or a ground from the 1st means of disconnect to come back to the CT cabinet to provide the EGC for the cabinet (this is using PVC conduit). If ned is used to bringing back the EGC from the 1st means of disconnect then I can see what he's trying to do.