To connect CDG, Intermediate Stations & nearby NCR to Gurugram, you need M/E for BDTS to regularize?? Even when it dont stop anywhere nearby Delhi/NCR, covers span of Haryana till Delhi & routed via Cantt!! Nearby NCR will not travel PNP/DEC for GGN but will grab Metro/Cab/Bus!!
There is no S/F & SL option except this which connects CDG-ADI/AII/BDTS (via NWR). CDG dont have dedicated daily Mumbai connectivity & regularization of this will keep Delhi grab Mumbai connection via NWR without putting any maintenance pressure over DEE!!