Good deciphering of the assassination plot,Anagha.
If what you say about the conspiracy is true,then I choose TJS as the master-mind behind this.
I've ruled out Suman,Adi and Reva.
Suman has no money whatsoever.Remember she was virtually begging Sugni for money to pay the bogus Baba(Hukum)?
Where will she get so much money from to TOP Vikram's sum he paid to Bumsukiya?
Adi is a pauper.He was living off Vikram.He hadn't any money to pay off Vikram,so he had to resort to fighting in the ring.We never saw him having access to the safe or Vikram's attache case.Unless ofcourse he stole the money from Vikram!š
Reva did know that Vikram was planning to kill Adi,but did she had full control over Vikram"s money to TOP the amount that was paid?
So here's why I think it's TJS.
Suman heard(by way of the mic she put in vase in Vik's room)Vikram speaking and planning with Bums.
She told TJS(who had become her friend by then) and he offered Bums maybe more, or even double the amount.
In so doing,Sugni,his enemy was out of the way and the icing on the cake was that Suman would blackmail Vikram to leave the mansion!
TJS had said before that he would "Move on Vikram very secretly to destroy him"
Now that I think about it,Bums had a few good oppurtunities to shoot Adi(by the window of the farmhouse,out on the back lawn) and yet he just didn't shoot.
So maybe,Sugni was the intended target after all as Anagha said.
Let's see if our guesses are right1