I have read those articles, and refreshed reading them again and my reasoning for his death hasn't changed. Those articles contain to much speculation. Not going to name all of them but 'a bear would likely not be able to sneak up on him', while bears are some of the quietest animals while walking. 'Nothing wrong with his cap', could have came off from the struggle, or a limb while trying to get away. And, yes, the clothes folded is not odd either.
The odds of someone following him and sneaking up on him are much less likely that a bear. He was in a very remote area.
Occam's razor definitely applies here.
Either way, it was sad to hear the news about Bart. The man loved the outdoors and adventure.