12313, 12259 and 12339 also traverse through Grand Chord on similar timings just behind 12301, change of schedule for 12301 would require slot adjustment for all these trains. Imo Mithila can be speeded up and run after Chambal group, too much slack which can be definitely reduced on both sides. VB can directly replace Mithila on Pf. 8 with Saraighat behind. Or the old Kamrup slot can be given to Mithila since it is for HWH-BDC section.