I found an interesting thing in the words of the Ri MiLunel which makes that the kasha doesn’t start:
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Basically he says that historically speaking they were willing to enact an 8 day yom tov even if the miracle of the oil had never occurred, because the story with the war was a big miracle and worthy of instituting a yom tov as long as Succos because of it. When the miracle of the oil happened, they figured hey we should light candles too.