magikarp: if it only woks for people who die that day, then town will know for sure who is talking. If all graveyard is talking, a dead mafia would be able to fakeclaim.
if chanelling on night 1, the dead guy will only know his own report, and nothing else. if channeling on night 2, there will be 2-3 people on the graveyard with a high probability of a maf.