I know I might be grasping at straws, but could this be a oplan between the inspector and Jai to catch the real culprit for Sahil's murder?
After all, Bani is in the safest place though it may be dirty etc.
Her life has been in danger and despite pleading from Jai she continued to go on her snooping missions endangering her life as well as that of Krishna.
Perhaps Jai really had good intentions and could not have foreseen that Krishna will come early....
The real culprit in the meantime will perhaps get careless and reveal him/her self!
I just do not wnt Jai to have any evil motives....
He is still the smartest one in WM though Bani treats him as if he is incompetent.