WASHINGTON -- So much could have gone wrong as SEAL Team Six swept over Pakistan's dark landscape, dropped down ropes into a compound lined by wall after wall, exchanged gunfire and confronted "Geronimo" face to face. The vital things went right.
Just about every contingency the 25 commandos trained for came at them, rapidly, chaotically and dangerously, in their lunge for Osama bin Laden.
They had acted on the best intelligence the U.S. had ever had on bin Laden's whereabouts since he slipped away in the mountains of Tora Bora just under a decade ago. But it was guesswork, too, with the commandos' lives, a president's reputation and a nation's prestige riding on the outcome.
Was the man once seen pacing the compound's courtyard really bin Laden, as it appeared to American eyes? That was just one unknown.
In short, the U.S. had no direct evidence that bin Laden would be there during the assault -- or indeed had ever been there. President Obama put the raiders in motion on the "pretty good chance" they would find their man, as CIA Director Leon Panetta, who was overseeing the operation back in Washington, put it.
Days after the attack, the administration has fleshed out a reconstruction that is probably more accurate than its initial, flawed telling. More information has been gleaned from the commandos themselves, now back at their home base outside Virginia Beach, Va. Some dust has settled.
The U.S. changed its story again Thursday when a senior defense official said only one of the five people killed in the raid was armed and fired any shots, a striking departure from the intense and prolonged firefight described earlier by the White House and others in the administration.
There remains no independent or competing account to the administration's story as yet. The reconstruction comes largely from Panetta, White House spokesman Jay Carney and Obama's counterterrorism adviser, John Brennan.
The only other direct witnesses are the compound's occupants, now in Pakistani custody and, for now, out of reach to everyone else.
Information gaps exist in the official account. Among them: why none of the compound's survivors was taken away by the Americans, and how many commandos stormed bin Laden's room. It may never be known which commando, or two, killed bin Laden with shots to his head and chest.
The question of exactly what the unarmed bin Laden did to prompt the SEALs to kill rather than capture him has not been settled. However, officials speaking anonymously told The Associated Press that bin Laden appeared to be lunging for a weapon in a room that contained his trademark AK-47 assault rifle and side arms. Still, to some in government and intelligence circles, the operation bore the hallmarks of a pure kill mission despite statements from officials that bin Laden would have been taken alive if he had surrendered.
On one point, however, there has been no inconsistency, revision or challenge: The raiders of Team Six made good on their "pretty good chance" and got safely away in a bold mission accomplished.