No chance, they have made rajdhani twice daily.
Contribution in other Delhi bound trains from NTSK and DBRG:
12423 DBRG 17%
12423 NTSK 32%
Total from these 2 station 49%
20503...
more... DBRG 27%
15909 NTSK 31.5%
15909 DBRG 17.5%
Total from these 2 station 49%
If they take BP mail Back to Dibrugarh, a lot of people from Rajdhani will shift thus reducing occupancy.