Kindly wait and watch. Guess making is of no use. Further, any train which trails Rajdhani will have priority as good as Rajdhani.
AP Exp trail SBC Raj from ET-MTJ & keep ahead for MTJ-ET with marginal gap, & overtakes SF meant to be looped for Raj just like SK for DDU-NDLS!!
But for DDU-NDLS, SK dont trail Raj & hence huge difference exist in Priority and Run!!