From what I have seen it does not look like JW sent AD to rescue Bani. I think he has a past (betrayal/rivalry) with JW and given what little we know he seems to like to win and has come to win some sort of final battle with JW. I think his goal is to build up Bani to be strong and than use her to destroy JW. One thing that confuses me is that does he know JW is being blackmailed into doing this because otherwise if JW hates Bani what use is Bani as leverage. Or maybe he wants to make Bani so strong that in her quest for revenge she will destroy JW and he is not thinking that having Bani in front will make JW weak. I was pondering on this because of his building the temple analogy, and Bani would be that temple that would arrest JW in his retaliation. But this would not work unless he knows the truth about Pia.
I think the ultimate goal of AD is JW's destruction. I hope they have a good story for the enimity and it is not drivel like the PR raaz.