May I tenderly suggest that no lessons are actually validated until this case is finally resolved.
As the legal case progresses, to the extent that we are informed of the progress, there will likely be additional lessons learned. But there are some to be learned now, as well as some already well known that need to be reviewed.
As far as pure strategy/tactics, nearly all lessons are already there to be observed and analyzed. We might get some additional insight if one of the robbery victims chooses to provide additional data that's not obvious from the video, but mostly we can see what happened, what was done well, what could have been done better, what wasn't a good idea, even if it worked out ok, what was a good idea.
For example, when I first watched the video, I noticed that one of the customers was fidgeting and moving around much more than the others. I surmised that he was the one who had the gun. Most of the other customers were very still. There's a good lesson to be learned there--had the robber actually had a gun and been a bit more observant/suspicious, things could have gone very badly for the CCW.
In the meantime, speculation as to possible outcomes and alternate strategies and questions as to various viewpoints (debate) is perfectly acceptable, as well as a healthy smidgen of lightheartedness...
I posted in response to someone complaining about armchair quarterbacking because that kind of attitude is problematic in this section of THR. There are no lessons to be learned if we look at every scenario and are forced to conclude (for fear of upsetting someone) that the defender/CCW did everything exactly right, no room for improvement, no errors. In fact, we would be learning bad lessons in many cases.
That said, the discussion needs to be more than just pure speculation. We have facts from the scenario (video), facts from the law, facts from how previous cases have been handled, facts about firearms and bullets, etc.
For example, it's not merely a matter of opinion that bullets can miss their targets or go through targets and hit what's beyond the target. So we can look at the video and draw conclusions from that known fact and from the apparent trajectory of the bullets in the video.
Another example: We can see that the CCW, from point blank range, fired a shot into the back of the head of an unmoving person on the ground who he had previously disarmed. We don't need to speculate about that, we can watch it happen. And watch it again if we aren't sure what we saw the first time. We can view those actions in light of legality and also in terms of pure strategy and tactics and draw conclusions that are far more than just speculation.