Well correct, as no RSA is required even & only it existed if bth train's total schedule would have been 7 days, not 6!!
Its simply, DRNTO runs to & fro NDLS & rest @ LKO on Wednesday while AC Express runs same way & rests @ LKO on Thu!!
When DRNTO run from LKO on Mon & reach NDLS on Tue, ideally, if in RSA, it should start as AC Exp on Tue, but on Tue, DRNTO starts frm NDLS!!
Same...
more... way, no such linkage any other day!!
PS: DRNTO exist in DRNTO Livery (with 1-2 Red Coaches), while AC Exp is all red, with 1-2 DRNTO Livery Coach!!