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In my opinion, the rules should be discussed before the tournament begins, not during it.
Since all participants have agreed to participate in the tournament, it means that the tournament rules are acceptable to them.
The rules are not needed for fairness, but for a clear and understandable resolution of controversial situations.
Yes, sometimes the outcome of a sporting competition may be unfair; this is a common feature of all sports, and Heroes is no exception.
However, in this case, determining the winner of the tournament with the match between Маретти vs Гомункулс will be a perfectly fair final. And how the remaining places are distributed is not so important.