It was not immediately clear where the information that opened the end game was obtained. The New York Times reported Monday that detainees at the military prison in Guantanamo Bay, Cuba, gave the courier’s pseudonym to interrogators and identified him as a protégé of Khalid Shaikh Mohammed, the confessed mastermind of the Sept. 11 attacks. But the Associated Press quoted unidentified U.S. officials as saying that CIA interrogators at secret prisons developed strands that led to bin Laden.
US tracked couriers to elaborate bin Laden compound - World news - Death of bin Laden - msnbc.com
Seems like myabe some of that stuff actual worked.