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Guys, I finally figured it out.
Ples can't be Jack. Jack discards all his Night Defense cards, and this action is one of the first he does. Only a couple of roles can break through to him. Even if we assume that in one night he used his ultimate ability and defended himself anally from Jones, I don't see a reason why he wouldn't use his Night Defense in another night. And we see Ples in both newspapers.