this is such a massive reach. Jacen says this in Dark Tide because he's a sixteen year old kid going through some ish and he isn't even sure that he wants to be a Knight ie warrior/defender/lightsaber user/person of violence at all, it has nothing whatsoever to do with "seeds of darkness" or him never having wanted to be a Jedi, full stop. it's like the exact opposite of that. also idk if you remember the rest of the series but he does discover what he truly wants to be/is, and that's "student/teacher", not "self-designated savior of the galaxy slash aspiring messianic sith lord." LotF absolutely does not build on stuff in the NJO, it swerves in a completely different direction because Denning had a story he really wanted to tell and nobody told him no.