I am re-watching the cross of ME, and it occurs to me that the sequence of the wounds is very important to them. I believe they already know the sequence, and are going to use that (either by Jodi's testimony, or in their closing) to bolster their self defense claim. Since we are only making an educated guess to try to figure that out, they have the upper hand in that area. I don't think it has anything to do with the cruelty factor, and what would it have to do with the premeditation?
Why would the defense go to so much trouble in their cross since they acknowledge her guilt? I think they are trying to tailor the testimony to the scenario she has given them - or in the alternative, at least the story they believe will (weather from her or not) will bolster self defense.
I think they're going to claim he had her pinned to the floor and she reached around him to stab him in the back.
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