I'm now convinced this whole thing was a black-op/false-flag or some covert alliance with something else that did the deed for whatever purpose we will never know.
All I do know is that every government agency involved in this is full of abject bullshit - and I no longer believe a word any government official or agency has to say about anything.
They are forever liars and not to be trusted to disseminate any kind of information beneficial to either justice or the populace.
We are on our own.
I am not convinced, but have seen nothing to compel me to discard any of several possibilities.
1 As you say. Could be. Other possibilities not yet eliminated.
2: SJS (Convert, sudden jihad syndrome, ties to Philippines, etc.) (recall te FBI somehow couldn't find tens of thousands of illegal e-mails and other classified information on Hillary's server, so looking at the laptops may as well have been from the next room, and seeing them on the table. Ditto with their 'interviewing go zillions of people about the suspect. With Flight 800, despite tens of thousands of pages of testimony they managed to NOT interview ANY of the 145 or so people who reported seeing something go up before the plane went down. Not one. I have little faith in that, either.
2a: Blackmail using relatives of girlfriend in PI, done by Abu Sayef (notorious for such things, esp. Kidnapping/ransom) (see above comment on FBI)
3: Organic brain problem: the results are based on visual examination, without pathology and assuming the brain is messed up, (Still no ME report) a tumor may be difficult to identify if the tissue is damaged by visual inspection, and may have been damaged or destroyed.
4: Mental illness triggered by gambling or other stress.
Note that it is unusual for a guy to kill himself using a pistol with other than a head shot. Guys want to get the job done, no screwups. Women tend to commit suicide with a firearm by shooting themselves in the chest, maybe out of vanity, but tend to avoid the possible facial disfigurement from the head shot. Certainly there are exceptions both ways, but those are the 'norms'.
I have yet to see anything which says that any of those possibilities can be eliminated. It is normal for initial data to be mixed up, and for things to be corrected as the investigation progresses. That might also mean someone is just getting the final story hammered out and shuffling the details to fit. Time will tell, we don't know yet, and the theories and data don't fit well. The one thing the LV LEOs have said that tends to enhance credibility overall is that "They don't know." which may or may not be true, but at least fits best with what we have been told.
Usually, the lies are whipped up, polished up, and stuck to. Center fuel tanks, and all that...