No place for GR at SBC as its arrival time is already a jampacked session:(
What you said may be true for travel between Hyd and Sbc as train timing doesnt match well. Only 12785 slot looks good and better to forget 17603 as it competes with HUP-SBC passenger in crawling:(
With only one train in evening time, definitely people crave for bus, but same is not true for travel between Sbc and Hyb where people prefer trains a lot.