Linu, it is a simple logic. As of now, except two, all the trians from TVC/KCVL are via ALLP/KTYM where as the route via NCJ-NMKL is way too short compared to via PGT. Thats the only reason I dream about very few trains via NCJ.
Raj made daily defnitely would be having 4 days of run via KTYM. In effect ALLP has 3 days KTYM has 4 days, and a new weekly Raj one day via NCJ would be a shorter distance