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Again. The tournament leader is a member of the Arbitration Committee (AK). In principle, the decision was within his power, but he was afraid to make a decision on his own and turned to his colleagues for help, which indicates 1) his uncertainty about the correctness of his decision, and 2) his lack of confidence in himself (a lack of real authority, or, if you like, he understands that he has less authority than the "defendant"). Conclusion? It suggests itself.
This is your opinion, and I respect it, as well as the possible existence of similar opinions from other Heroes players.
Why didn't he make the decision to disqualify Alex from the tournament on his own?
There are Rules of Procedure for the AK, which are outlined in the first post of the AK topic. Take a look at them. I believe that I acted in accordance with the AK rules when I did not make such a decision.
There is the AK, a collegial body, and I believe that the AK, rather than me personally, is capable of making a more qualified decision.