It will be interesting to see what they can infer from all of this. There are many plausible yet unprovable scenarios that this will have to remain an open finding.
Having flown Beavers, the dreaded flap selector valve position theory appealed most but it seems that at impact the flaps were at approximately 15 degrees - the so called “climb” setting, thus blowing that theory out of the water.
Why the turn back into JB? Maybe a request from the happy and fun passengers to fly in there for a look, cheerful pilot eager to please has a brain snap and isn’t concentrating but chatting and enjoying the day suddenly finds himself in a bad place with no way out?
The theory of the pilot being knocked out by an exuberant passenger, while plausible, seems difficult to accept. In all likelihood, he would have been wearing a chunky noise cancelling headset, not leaving much of the head exposed to a blow.