This is what i think too, Pakistan can easily overrun IOK, with superior mountain warfare tactics and local support. Its in the southern planes where india will deploy massive numbers.
If Pakistan make gains in IOK and india starts to move forward in south punjab planes, we should live fire test a few tactical nukes on our side of border. It will deter them, scare the shit out of the whole world. The radiation levels on border will be really high and not feasible for india to attack. This will also cause international community to stop the fighting and we would be able to keep our gains in IOK.