[Huliwang]

Conspiracy theory is that the powers that be also headache over Iswaran.  

During the interrogation, he probably let on that if he was charged, he will reveal more and that will probably bring down others together with him.

So now delay charging him to get rid of latent evidence and give enough time for those that need to run road, run road.

Why else the inordinate delay lei?

That's threatening the Empire. Dun think Israwan dares or stupid enough to do that knowing too well he will run into bigger trouble if he tries to pull others down with him. I think more likely Modi stomped his foot down and pressing on someone's testicle to let him off by hook or by crook.