From everything I have seen (including Bleach) and researched into this, I honestly think (handwriting sheet aside) that Cali was with Kurt when he died. I don't know to what extent his intentions were, but the suicide is sort of fishy. You have the shotgun shell to the left, a shotgun with virtually zero prints, Kurt…

The shotgun shell would have been near the right of the body, and even if it had managed to hit his forearm and land to the left, it would have made it maybe to his left side by a foot or so. The inertia in the ejected casing is strong but hitting a soft forearm is going to knock 85% of that inertia out of it. It…