FIR se name bahar nikal diya?
How? Is FIR got amended after registration?
Chargesheet got submitted after investigation?
In Chargesheet, yes the police can add additional accused based on the new findings/161 statements by witnesses in the investigation process. Even the charges/sections also can be altered/added/modified based on the outcome of investigation.
Generally there is a practice that some corrupt police themselves suggest the victim to add non-related people names also in the complaint for FIR and then they demand money to remove their names. And sometimes if the IO transfered/changed then the story begins again if no satisfaction done then their names get added again.
Instead of puzzling, quizzing , please convey the facts in a straight forward way.