The eye witness accounts still leaves too many questions unanswered.
1) Is the account reliable? That is to say, how much of the truth is the news revealing?
2) Was Bin Laden resisting arrest / trying to escape after he was caught?
It is obvious that none of the sides are telling the whole story, aside from the fact that Bin Laden is dead. However, I think it is safe to accept that Bin Laden was shot in the head (above his left eye) and in his chest.
Using just plain common sense, it would have been a far bigger victory for the US if the Navy SEALs could arrest Bin Laden alive. Therefore, it would make little sense for them to kill Bin Laden -- execution style -- as the report is trying to suggest here.
I'd say the US gov needs to tell us more and provide more evidence on what has transpired.