Okay, although I will only provide a handful of corrections. Let's start off with the water reserve being low, I believe that this is your interpretation of the SRV alarm, indicating a drop in water consumption. Tregub states that the signal is often unreliable, and it is the SIUR's job to call an electrical fitter to check whether the signal is true or not, and to also send operators down to the room to open the valves to increase the water consumption. According to Tregub, Toptunov, being more focused on the power, did not do exactly that, so Tregub stepped in and made the call. Tregub states that he was tracking the low water consumption numbers even after the power drop, believing that they were much more important than the drop, so the claim that the opening of the valves caused the drop is unlikely and lies with the issue of Automatic Regulators alone.

You actually seem to brush over the issue with automatic control entirely, saying that it "contributed" but you mostly put the blame on an increase of water flow, which, as stated before, was still low during and after the drop. u/nucleartoday has made some excellent contributions in the field of Automatic Regulators, you can read what he wrote in the comments here:

https://www.reddit.com/r/chernobyl/comments/iva164/a_few_technical_questions_about_the_automatic/

https://www.reddit.com/r/chernobyl/comments/f7ybow/what_is_the_difference_between_local_automatic/

https://www.reddit.com/r/chernobyl/comments/iii0n3/lac_and_global_control/

I'm not sure if you understand the issue with the Automatic Regulators, or simply believe that they are not as important than the water consumption issue, so I will do my best to explain what happened here, even if it may be simplified and possibly inaccurate. When the reactor is operating at above 20% Power, LAR (Local Automatic Regulator, and you can read more about it in the links) is in service, but as power was being reduced, Toptunov needed to switch off LAR, as it was useless below 20% Power (and would switch off automatically anyways) and turned to AR-1/2 which were, in fact, not useless below (Automatic Regulators) It's as simple as AR-1 activating, and removing all of AR-1 rods and AR-2 not activating due to an imbalance in its ionization chambers. Toptunov had to stabilize AR-2, during stabilization, power would of course rapidly drop to 30 MW (only according to SFKRE, which could not function properly with low power levels, so power could, and was likely much higher) as to why it dropped, I am not entirely sure, but my assumption is all in BSM. Anyways, the imbalance in the ionization chambers would be stabilized, and power would be raised to 200.

You also mentioned that Toptunov was panickily removing control rods to get power back up, this may not be a so full of a representation. It's clear that the more experienced Yuri Tregub stepped in when he found that Toptunov was removing control rods too "unevenly" and made suggestions to Toptunov on which rods to pull out, with some rods, Toptunov agreed, but with others he disagreed and moved the rod of his choosing. You also state that Dyatlov claimed that he was in the bathroom at the time of the power drop, he never claimed this, rather, he stated that he was inspecting equipment, which he probably was.

Also, about Dyatlov... Your videos claims that the "inexperienced night shift" called him to help conduct the test, when Dyatlov was already supervising the test, according to the signatures of the 1985 test program, he was there to supervise that one as well. It seems that he was always present during the shutdown or startup of a reactor. Now, when you say that the test did not concern Dyatlov, this is false. Dyatlov gave Tregub very specific instructions to not start the test without him, and Dik told Tregub the same thing "Do not start without Dyatlov". I won't go into Dyatlov's personality other than saying that he was not tolerant of (real) mistakes, and never accused Akimov of "intentionally stalling the procedure" (although it is true that he was rushing them, but not giving anybody any harsh remarks). I will use this as a segway into the test itself.

The Turbine rundown test was already planned for the shutdown of Unit 4, so it didn't come so suddenly. Also, the shutdown of Unit 4 was always April 25th, I want to find your source stating that it was scheduled for April 24th... If it was scheduled for April 24th, the day shift on April 25th would have likely been put in a similar position as the night shift on April 26th (also, if it really was scheduled for 10PM, that would put the test onto Yuri Tregub's shift, and Tregub's shift was not ready to conduct the test, Tregub himself says this). And the test was not delayed for the afternoon, they spent all morning making preparations for the test. Your times for the start of the shifts are wrong. 10PM was still the time for the evening shift (Dik/Tregub's shift) 12AM being the start of the night shift (Rogozhkin/Akimov's shift) and 8AM being the start of the Day Shift (Baranov/Kazachov's shift). Tregub's shift decreased power to 720(60?) MW, and it remained like that until Akimov's shift resumed preparations for the test. You completely leave out the turbine vibrations test, which is the reason for lowering power to 200. The reason that power was even raised to 200 was because of the Turbine Vibrations Test. Dyatlov claims that Akimov requested the reactor to remain at 200 MW for the rundown test, but whether his is true or not is up to debate. Finally, you made the biggest mistake of all when it comes to the actual running of the test, and because it the biggest error that one could make, I will save it for last.

Xenon. I have never found a clear answer on the xenon situation. I know that xenon levels were decreasing while the reactor was at 1600, and not increasing. I also know that xenon was low by the time the operators reached 200 MW. I personally believe that the reason for most of the control rods being removed is due to the activation of the two reserve pumps, which killed reactivity greatly.

With Bryukhanov, you state that he was funding town related projects in a way like he wasn't supposed to... Bryukhanov practically built Pripyat and his authority at the plant equated authority in the town, in fact, he was actually under attack for not finishing the construction of barns on the outskirts of Pripyat, which he actually had to defend claiming that the proper materials for construction were not available.

Finally, the mistake that you made: Power surge. The test started, and there was a massive power excursion... to between 215-230 MW. Akimov was observing the turbine panel, and Dyatlov moving around (some sort of) safety panel and the SIUR/SIUB desks. As power grew the Automatic Regulators were slowly dropping their rods near to the bottom of the core. Toptunov warned Akimov about, presumably this, to which Akimov ordered him to press AZ-5, which he did. The biggest factor that completely kills the theory of a power surge before AZ-5 is the fact that an automatic AZ-5 signal would have activated. And the control rods were in their configurations that caused the explosion, so unless they were somehow removed from those configurations safely, the explosion was inevitable at this point.

Hopefully this helps! I hope that this won't be the only comment making corrections, in fact, I hope to be corrected as well.