The only elucidation on the circumstances of OBL's death I've heard is that he was unarmed, did not use his wife as a human shield, but apparently still resisted capture. I don't want to speculate on details, but I can tell you this: every minute of that 40-minute mission was planned out and practiced endlessly before Seal Team 6 arrived. They would not have killed OBL if that was not their plan from the get-go.
They did not want him alive. For security, they'd have had to take him to Gitmo. Now that Ukiah is there, their concern was that he might start talking to Osama. That would pose the grave risk that, before trial, Bin Laden would attempt suicide, repeatedly.
