Club championship of the CIS countries.

Vik, to give someone a piece of your mind – or rather, to be able to judge fairly – you need to listen to both sides! And Mizrael started the conversation with me using profanity! And in response, I wrote that I could just tell him to go away.
That's the first thing.

If in soccer, a player or coach uses profanity about the referee in an interview before or after the game, they will face public criticism or, at worst, a fine. If it's in the game, they'll get a yellow or red card. And neither of these will have a significant impact on their career.

But if a referee does the same, it will be what the army calls "failure to meet job requirements." With corresponding consequences for their career.

That is, players can express their emotions, let off steam; it's part of their role, but referees and organizers must behave and speak as calmly and impartially as possible, no matter what happens. Yes, it can be difficult to do sometimes. But you have to try.

And secondly, Vik, you are a referee, but not an organizer of this tournament. And you cannot decide who will be a participant a priori.
Stinger and Preds did not pass the qualifying round in Moscow. That is, the Michurinsk team is weaker.
Preds took 2nd place in Michurinsk,
Stinger took 3rd place.
In Moscow, Preds took 6th place!
And Stinger took 4th place.
Therefore, if Preds is 6th in Moscow and 2nd in Michurinsk, Vitalik is definitely stronger than Mizrael and Skorp.
You like to calculate Berger's coefficients... please calculate them.

I have a different logic, which I outlined above. In particular, that judging the strength of a qualifier based on his results is foolish.

Let's take an analogy from other sports that use group tournaments – is there ever a regulation where 5 people can qualify from one group, and 3 from another?

I don't know of any such regulations. Usually, if it is planned that a different number of participants will qualify, the number of quotas from the group differs by a maximum of 1. That is, a higher position in one group gives an automatic advantage over a lower position in another group, even if that other group turned out to be stronger.

And only if the positions are the same are there any possible variations.

Therefore, I believe that Mizrael, who took 4th place in Michurinsk, has a preferential right to participate in the final compared to Vitalik, who took 5th place in Moscow.

If you disagree, you can turn to Nagan to have him judge this situation. I think he will support my version.

And if you don't like the organization, I will relieve myself of the responsibility for all of you coming to Kyiv.

The organization is generally good, but there are (and will be) disagreements about individual nuances. They are inevitable in such a matter.

So, decide right away, are you taking on this burden or not. I know from experience that this is a difficult task, requiring considerable patience, balance, and the ability to compromise. Especially in this tournament, where the team is very diverse, with many hidden conflicts and grievances. But the more respect there will be in the event of a successful implementation.

If you don't take it on, then say so right away so that they have time to prepare in Michurinsk.