Dude, that's not at all the matter. JHS extension is just useless it will downgrade the train, this train will arrive GWL 5-6hrs late from JHS (Look at JHS-BDTS Express), cleaneness of this train will be gone, general coaches(which were initially meant for GWL) will always remain full from JHS.
Only Benefit GWL will get - 1 Empty pitline = Extension of AF-ADI to GWL.
I would love to see your reaction on extension of Mahamana Express to somewhere else 😂