Planning and premeditation aren't the crucial variables - it will depend on AZ and Federal statutes. Then who has custody of him for actual sentence or insanity provisions will be important
Also, if he is found insane or guilty and insane, he will go to involuntary psychiatric treatment and be forced to take neuroleptic meds, most likely. These can be very, very unpleasant with all kinds of permanent and nasty side effects.
No who is thinking rationally would set themselves up for that life.
This is a very technical issue, so surface analyses are really worth too much, yet.