You obviously missed what I said at the end about juries, media, public, etc...especially juries.
Oh, the horror, he used “excessive” deadly force after he’d already fatally shot him....
The part that you are missing is that the number of shots will be used to establish intent. It will be difficult to argue that he did not intend to kill the guy when he shot him 16 times. So now you have to watch the video and determine if it was self defense, defense of someone else etc. To make the shoot justifiable. If you can’t come up with some really good reason to justify killing this guy... something that makes sense to a jury, and is consistent with the applicable law... it is what it is guy. I know you’re the expert. But the internet is filled with people who went to jail for a long time for lots less than shooting someone 16 times.