As this is the critique forum and nobody has done anything yet here's my go part 1:
General observations. It might be a symptom of newness of the sport in Russia and despite some people playing abroad many of these guys throw similarly to each other. I suspect they are learning off of each other more than they should've. That's about to change if you guys pitch in
Common things i noticed in the order I think of them: Many times people tilted their heads right in the end of the throw. Don't. It may feel like you're utilizing more muscles to generate power but it's hurting balance and dropping accuracy and consistency. They are on their way to getting a shorter plant step and getting the heart over the right knee as the disc leaves the hand. It's just a matter of practice and time.
They asked me how does one get the plant step more to the right for a hyzer or flat release? And how to get the weight forward? I showed them the flexibility limits and onset of internal resistance from muscles in the hips. I told them about not leaning too far back in the x step by not making it too long. A shuffle step would help with that. The drawback is that everything happens faster so it's more difficult to control your body, form and timing but done right it gives more power. You can push forward with muscle power from the abs and back muscles by bending forward at the waist. Masterbeato's form thread and the recent Avery Jenkins vid of the latest disc golf Monthly plus the grip it to rip it article on the main page give a lot of detail previously covered on the forums about wrist down. Most of which I told at least one of the guys. The longest thrower.
I told them to wait for the arm pull until the last step plants. The clue about getting forward I forgot to tell them is to keep the right knee bent by 20-25 degrees so that once the leg plants your torso is already leaning forwards to the target. You need to wait until the foot touches the ground and it feels counter intuitive to wait in the middle of a throw because the naturally occurring idea that making the disc go from reach back to forwards as fast as possible is just plain wrong once one enters the way the body works and necessity of maximizing the spin on the disc. I trained the wait by mentally telling me to wait, wait wait... until the right foot touches the ground. Then the fun is about to start

Minding late power focus.
The keys to getting the right leg planted on the vector you're running on or to the right of that for a flat or hyzer release is to bend the left knee in the x step and push first forward then in the end rotate to the right. All the while keeping the right knee bent. Another thing that helps is to move the right leg to the right side. If you were standing looking at the target the right leg would kick 90 degrees right of the target.
Hwicha asked me about how to get accuracy and I replied consistency. The tourney he was playing has tunnel shots and tight spaces. How nice and straightforward of me

They are inseparable because they come from the same source. KIS principle dictates the least moving body parts and least possible amount of motion from each part enough to reach the target. It's analoguous to using the slowest possible disc to reach the target. Why'd you throw that disc at 100 % power when 80 % reaches the target and allows smooth accurate and repeatable motions where you don't have to take your eyes off of the target? So you can aim with both the body and the eyes.
Using much less turn angle on legs and hips away from the target helps a lot. One could even throw with the arm solely. By facing 90 degrees left of the target throwing with the arm without steps and weight transfer. Doesn't get much more minimalistic than that. Naturally distances are slashed but accuracy and repeatability go way up. With practice of course but it's so worth it I promise if you get things right. Even with weight transfer and steps as long as you don't put more than a couple of dozen degrees of leg turn and hip twist. And slow down. Seriously!!! Everything except elbow chop. Doesn't mandate little power from the legs and hips as long as you accelerate quickly but controllably up to 80 % power very late in the throw. Where the real power for the throw both in linear speed and spin rate are generated anyway. You'd be surprised how little distance you lose to fairway drives with halving or taking two thirds off of the turning angles. Don't need that much arm reach back either. Maybe a third less than usually. Experiments for best personal results as always...
That 80 % or even less power means that you can start arm pull at minimal power and use so little power from legs and hips that you can maintain balance even on rough fairways or natural tees easier. Since you're only using full power in the elbow chop the base you're throwing from should be nice accurate and dependable. Once you train the timing and form to be facing the target with both knees, torso and arm extended fully to the target when the disc leaves the fingers. That's a matter of training.
The 100 % power in the elbow chop is mandatory if you wanna get spin on the disc and feeling of the acceleration. Spin is nice because it allows straighter flights with less fear of flipping over and skipping when landing because it allows slower throws. Which minimize tree kicks. Feeling of the acceleration is another thing with which to aim. There's a bit about that in the articles section from Dave Dunipace.
Trying to stop the wrist so that the disc will add to the spin rate as the wrist is extended fully seemed to be a new concept. It's impossible to achieve that bit the attempt makes all the difference once performed right. I'm not there yet especially consistently. This is the most important area of improvement for me. Again for a more thorough explanation I'll refer to the articles section on the main page. These articles get clearer with more knowledge and experience so it's worth it to read these many times over as you progress. I know I didn't get many ideas right on the first reads during the first year I read those
One common issue with the guys messing nose down throws was to start the arm pull low at the reach back and raising the disc elevation by 4"+ at the release. They got that under control fairly well for such a short time of practice I witnessed. I suspect it to become a non issue for line drives shortly based on the rate of improvement. That raising line ain't a problem for hyzer flipped max D s-curves or golfable s-curves with good wrist extension and nose down. More wrist down angle late in the throw helps like Avery Jenkins wrote in the comment section of his blog at
www.zonedriven.com.
Flat shots need running on the center line of the tee and planting each step on the center line. Anhyzer needs running from rear right to front left with the plant step hitting the ground to the left of the line you're running on. Hyzer is the mirror of that.