As far the historical FACTS goes, before deliveries of blk-52 (C-D), Indians were assured through US senate, that our ordered F-16 are not going to hurt Indians. Your people were thoroughly satisfied, hence deliveries follow through. One of your request was that US teams will make regular inspections of our F-16, which US agreed as well, despite the fact that they had other controls in place for the purpose.
Same cannot be said for the earlier eagles from 80's and as i see, you are not suspicious of older blocks.
Now you tell me, why would PAF fly F16D... good for nothing vs. India!? Unless you claim PAF made a mistake !
You really need to strike out F-16D from your list and change it with some other model.