PC will be detached from KK for SBC-MAS mail and for some period of time they had even PC for SBC-MAS mail making it difficult for passengers inside to switch coaches.
--------------------------
When I was in Bangalore KK was delayed contsly for 3-4 days which ffctd sbc-mas departure but one day they had arranged extra rake for SBC-MAS Mail which left ontime while KK arrived at 3am. So I think SWR had adjusted with some extra rake due to late running of KK.