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Could you please ask Vika, as a judge and organizer, to officially list the allowed options? Having one player from a team play 6 games ("substituting in") is, in my opinion, a much worse option than fully replacing one player with another.
P.S. I understand that Savitar has gained some reputation recently, but at the time of the draw for this tournament, he would have ended up in the 5th or 6th seed at best, as an absolute unknown.
