There is very little chance that India knows with enough certainty where all the Pakistani nukes are to risk a preemptive strike which might be answered by a well hidden Paki nuclear tipped rocket.
Remember, on the last day of the Gulf War Iraq was still firing SCUDs. With every US satellite, recon plane, SAS troop etc looking for them, they continued to evade detection and fire.
Oh I really don't think so. The Chinese appear to be behind OBL. They certainly aren't onboard with us.