Let's see...some epiphanies...
1) I never quite understood why certain people had all blacked out sights. Now I do because apparently I can't hit jack shit at distance with stock Glock sights. I also apparently can't hit shit very well with the rear blacked out all the way either. Both front and rear sights blacked out? Apparently I can. I don't know exactly what I was doing but I couldn't for the life of me shoot a group at 25 and 50 yards. It was bad when the head instructor looks at your target, you, the target, you and then replies, "You might want to put the shotgun away and get the pistol back out." Again, I'm not sure what was going on because I was focusing on the front sight, fundamentals "appeared" okay from everyone else's view that watched me shoot but things didn't come together until I blacked out both the front and rear sight with a sharpie.
2) In low light conditions, people tend to shoot better because they don't have any other external visual distractions so their focus is better on their sights and front sight.
3) This was my first time actually exposed to using a grip around the slide or a thumb behind the slide of a Glock to keep it in battery while doing contact shots. Afterwards, a tap/rack and movement to get back in the fight.
4) Stance doesn't matter. Weave/Isocoles...whatever. In a gunfight, you'll be in a stance that doesn't even have a name. Both have disadvantages and advantages. Find what works for you but don't get tied up around the axel about it. Head instructor is a plank owner in Hojutsu and Combat Marksmanship and proscribes the Weaver stance. I'm not a fan and shoot more Isocoles. It doesn't matter. If you can perform on demand the task at hand and get good hits on time while on one leg with your left arm behind your back? Good on you.
5) It was taught to me by Mr. Grumpy last year at an EAG course and was reinforced here: when you draw, focus where you want the round to go. Most of the time, the rounds will go where or close to where you wanted them to go as the pistol and sights will come into your sight.
I'm sure there are more but currently at work so...