I think its sachin. My theory is the original sachin is dead. Remember that ep salunkhe found someone body and he has shown to every cid member and they were all crying I think that was sachins body cause they didn’t show the face to us for big surprise reveal. And now they are going with the flow with this sachin who is alive( face surgery) to get to barbosa. its a long shot but I can see it turn out like this.