For quite some time I'm reconsidering our focus on the R-R line and it's significancy, the galaxy arms etc. I think that with this statement "CMDRs may wish to consider the, ahem, core of the problem." Drew tried to turn our focus on the core worlds. Most of us were too eager to solve the mystery and rushed headless into the void (including me). IMO this "Whether it is found or not depends entirely on who goes looking." implies, that the person need to know some information, that could be obtained only in the core worlds or via cracking the Galnet articles about senator Kahina. Remember, that the clues from the book are only complementary. We took the R-R line and other things from the book as solid facts, maybe they are not so solid.
I'd go back into the Bubble, to search for the main clues, but my RL is quite hectic and does not allow me to invest so much time into the game, so I will remain in the void and try my luck.
The thing is....we just don't know how the games works. I could go to all the systems required and miss what's there (if anything). I could put it down to a bug or something. 99.99% of games we get in 1day-1week. We know how the mobs spawn.....we know how thay act...or only other players give us variety nowadays.....then there was elite.....that keeps you guessing and ripping every sentence any official makes to shreds for clues..