I will never understand these conspiracy theories.
You are wrong on several counts. First of all, it is impossible for the picture of him in the shower to be taken after she shot him. Why? Because that picture was taken BEFORE the headshot and the headshot clearly shows no bullet wound.
Second of all, very clear testimony from the medical examiner explains why he was shot last.
Third of all, based on the fact that he was shot last and would have been incapacitated by them, it is not necessary to speculate on a particular angle of entry because she could have placed him in any position she wanted to before shooting him.