Bulgaria did not want to see Bulgarians in the finals with Russians
According to Russian coaches something is suspicious when all best Bulgarian wrestlers were set to meet the Russians early in the bracket. Its just too much of a coincidence when KK and Kudukhov both had Bulgarians in the 1st round and Farniev had Barzakov in the quarters.
Perhaps Bulgarians did not want Bulgarian fans to see Russians beat Bulgarians in the later rounds or the finals. That Soviet superiority stigma still hunts Eastern Europe.