Back in 1998, the last time that there was any solid info on OBL's whereabouts, the US notified Pakistan that they had launched Tomahawk missiles towards his Tarnak Farm compound, since the missiles had to cross Pakistani airspace enroute to Jalalabad. The US gave Pakistan about 15mins notice, but reports at that time show that OBL received a phonecall and was rapidly removed from the area before the missiles hit. After that, there was about zero actionable info on his whereabouts - that includes the "sightings" at Tora Bora...........until this recent job.
Given what happened in August '98, can you imagine what the conversation between the US & Pakistani generals would have been like this time?? "Hey, Azif, yeah, it's Dave. Guess what we're doin' right now?"