I just read the Great Darkness Saga (would you believe that I started reading LSA 2 issues after that storyline and never read it until this past week when I bought those back issues?) and I've been considering the same thing. I think it's relivent because, why else would the original Legion be back in continuity, why would the big Legion team-up of all 3 versions be a Final Crisis tie-in if there weren't some connection, and why would they stick Thom Kallor in the JSA and say that his starfield costume is actually a map to the multiverse? Personally, I think L3W is going to be a very pivotal series and will tie in to FC very directly. Just how, I haven't figured out, though.