Let's see. Anyone could be involved. I am open to KK being evil as well. They have been stretching this airplane crash+ Prabhakar's death for more than a month. It's gonna be the single major background plot of the story, the main plot being the love story itself. I don't think they'll disappoint us by giving us a very typical villain.
I am sure there's more than one person's hand in this, and I personally would be very happy if they show that the present scenario is a result of two different actions, unconnected with each other but somehow the impact ended this way.