"brutal" is needed or else what is to stop a JL if it forms when both doc and GA is alive? You could even get a seer as JL spokesperson and a JL forming around him on day 2.
Insta-JL is a game killer. The game is no fun for villagers how only get to follow a JL spokesperson or for the baddies who must blindly try to hit the GA/doc before they can even attempt to get at the JL spokesperson or the seer (in the lucky event the sorcerer has found him and hooked up with the wolves).
GA/Doc might not be 100% guaranteed save. In WW big, Seer can't scan everyone by himself, so hardly a JL could be formed like you say. Also, there is Cursed (and blessed/lover/doc provoking no-hunts,which have the same mental effect) trait, to counter this.
EL, your idea is interesting. Obfuscating identity after death, without a choice (so people won't be assumed to be baddies by voluntarily concealing identity). I still dunno if the people themselves should be aware they have that trait or make it hidden...