Nicodemo's defense is so stupid I almost believe it. It's a planned it and you are just going to run home right afterwards, leave the gun in the car and use your own vehicle for the job? I don't think the whole story is known. Something had to have went wrong in order for Nicodemo (am accomplished hittman himself) to panic and drive home.

As a defense, I think the defense has to have something up it's sleeve. Nicodemo seems confident he'll get off. I'm guessing the "drove away at gunpoint" story is their hope of putting enough doubt into at least one jury's mind in order to not convict him. After all, they can't prove he was not carjacked, can they? From what I remember the prosecution has some evidence that contradicts the defense's claim, but it's not damning.