they are reporting here that when he was found that he used one of his wives as a shield and went for a weapon and that is when he was shot.
In thinking about this operation, I'd guess that the objective was to kill OBL with no option to capture him alive. We would gain so little value by having him alive (if any) and a ton of drawbacks related to how "civilized" people would treat him.
This means he would be executed no matter what efforts he made to surrender.
One of the helicopters was reported shot down by the defenders so OBL would not have been surprised in bed by the SEALS entry into his room.
I have little doubt that from the second SEAL team 6 left on the mission that the official result was OBL was killed offering resistance.
I also have little doubt that the official disposition of the body, should they manage to pull out with it was that he was buried at sea was known from the start of the mission.
I'd guess that from the start of the mission, the goal was 1) to get OBL dead and 2) to lose his body forever if possible.