CNB belonging to NCR has only 1 dedicated rake for this train. Hence if 1 trip gets delayed, other trips get further delayed...
LKO shatabdi belonging to NR has rake sharing with KLK Shatabdi. So NDLS departing shatabdi always departs NDLS ontime and while only LKO departing shatabdi is rescheduled. Also, when this late shatabdi reaches NDLS next morning (over 8+ hrs late) then NDLS KLK shatabdi is rescheduled, while incoming rake of KLK NDLS Shatabdi is used for ontime departure of LKO shatabdi from NDLS.