Probabaly BSB-CDG spl shd be regularised, and CDG-LKO extn to Gorakhpur, if not daily atleast twice a week...
but that will spoil the record of Sadbhavna Expree, So better, CDG-BSB Spl can be regularised, with twice a week run to BSB, and once to GKP,,and then see..
Th reason:- successful trains tend to get bad reputation on extensions,, same needs to be avoided for sadbhavn express, instead better to start new train to new destinations like BSB and GKP.