I don't doubt that we had help inside Pakistan from some source. I doubt a bunch of white guys sneaking found him by themselves.
Since the alliance started, there was a fairly large scale CIA and ISI combined op to take Al Qaeda down in earnest... which is how we got KSM and the others. However, within the ISI there were elements(both extremist and opportunist) who started work against these teams.
The extremist had sympathy for what they thought were Muslim "assets". The opportunists saw a way to prolong the war for its benefits. Neither had official sanction but did have a network within the military having a similar mindset.
So here is the team that is working hand in hand till at some point the ISI team gets its resources culled completely. That apparently has to with another parallel CIA team working on finding out the locations of Pakistan's nuclear program which this CIA team knows nothing about. Everything after that is hazy but what I could piece was that the nuclear intrusion irked those in charge and gave an opportunity for the Al-Qaeda/Asset sympathy to turn the ear of the then head of the ISI(who was shocked white at first finding out where OBL was).. it was probably decided that letting him out of the bag would be an embarrassment and just killing him would also be an issue.. so he was left where he was left..all this while the CIA team/directive that was working with the ISI(not anymore) never stopped and how they got to him they did.
Welcome to the spy game.
Its a map drawn by Mark Owen( the Navy SEAL who had participated in the mission) in his book No Easy Day: The Firsthand Account of the Mission that Killed Osama bin Laden (2012). The map shows that the black hawk which was carrying assaulters crossed over Pak’s eastern border with India before looping around and approaching Abbottabad from the southeast, rather than approaching directly from the west (or west-northwest).(none of this is confirmed by the govt.).
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Makes no sense, as there is MUCH better surveillance on that side of the border than in the west.