I don't know, maybe I'm in the minority, but I didn't really see an issue with the Henderson stoppage.
When he got cracked by Mousasi he went limp and hit the ground like a sack of potatoes. He seemed to get his wits about him slightly after a second, but Mousasi was already on him by then and starting to rain down shots. I suppose you can't rule out the slim chance of Hendo somehow not only surviving but being able to also fight effectively, but it's much more likely that he would've gotten bludgeoned unnecessarily. I know some people will say "But look at his comebacks against Fedor and Shogun!!", and to that I would say; isn't it concerning that he keeps getting flash KO'd like that in the first place?