Yes 5-6 ACC DD is enough in weekdays and they can add another 6-8 Chair car but during weekends and Friday afternoon from SBC and Monday morning all the seats are getting filled 90% days and as you know ACC get 90-95% cost of operation back adding CC IR will have to bear loss to the extent of 50%. Ideally IR should run trains with change of rake composition according to day and season rather then have a fixed rake. For that they need some planning and rear tear of coaches decreases.