In the event that I haven't mentioned it before, the sequence of killing blows has been adjudged to be irrelevant with respect to the Aggravating Factor (Cruelty) that has 'qualified' Jodi Arias for the death penalty should she be convicted of Premeditated Murder.
However, the sequence--did she shoot Travis before she stabbed him--is the lynch pin of Jodi Arias's defense--it holds her story together and is the single most important element of her defense. It is her only chance of getting off if the Jury buys it. Jodi's defense is
"self-defense." That justifies Jodi picking up the gun. Then she mitigates the killing of Travis by saying the gun went off
"accidentally." That gets her off any
premeditation/deliberation. Then she claims that she was immediately overtaken by the 'vapors' (she calls it a fog), and has no memory of the butchery on Travis body that followed the shooting. Then her lawyer and experts come in and back up the memory loss bull by arguing that the shock of the 'accidental shooting' and Travis vicious assault, triggered her 'crocodile brain' (look it up), calling forth unconscious primal impulses that compelled her to pick up the knife and butcher Travis dead or dying body; overkill for which she cannot be held responsible under the special consideration granted to 'abused and battered' women. That gets her off the
stabbing and slitting. And once all of that is out of the way, she gets to walk. Of course it's important for Jodi to win the sequence argument--gun before knife. She benefits enormously cause it backs everything else up. It is almost equally important that the Prosecution not allow Jodi to win it.
None of her defense works if the Jury does not accept that Jodi Arias shot Travis before she stabbed him and slit his throat. It all falls apart if the Jury concludes she stabbed Travis before she shot him. Of course, Team Jodi are not going to let one little thing go by that could lead the Jury to conclude that Jodi stabbed and slit before she shot.