I wonder if, when ST arrived, RB came at him, shoving him and confronting him about whatever drug or money issues. Sam came back at him they start fighting and RB accidentally kills ST right there. Then calls AD for help. AD may have not even known about sam being in the car. If RB was involved in the robbery before or at least aware of it, he may have just asked AD to follow him so he could dump it. This explains the stupid purchases after the fact and moving of the car again. That makes the most sence in explaining ST being attacked in driveway, purchasing of items, AD not knowing sam. imo
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