Now you need to ask court to complete charge sheet and get accused into police custody, so they accused will open mouth in the custody.
Or here you need to prove charge sheet is not correct has few doubts in it when this got changed.
Present or call both accused in the court for cross examination at a time kumar and A1
I can provide you supreme court 2-3 citations on similar case. Need case full history, issue, fact and current trail proceedings.