Well it was clear rakshit was jealous of Drishti talking to someone. And Drishti knows he is anjaan and to make rakshit jealous she said that can we get married in the mandap you with LA and me with my someone... lol I think dulhan exchange hoga..
Pi asked anjaan to make rakshit marry lavanya and she said that after guru hi his vanj will get the powers and he will become suraksha kavaj for DD.. to make them less powerful rakshit has to marry dumbo Lavanya so that him and Drishti won’t be powerful together. So after marriage rakshit gained his power from the death of his nana...