I can't see how it had anything to do with Tigh. I thought it might be one of the handful of clues Ron says he's peppered the series with. I figured it stood out, and if there's a bunch of similar things it might start to form a pattern pointing at one individual.

I wondered if the appearance of The French Lieutenant's Woman book might be another clue, or any of the titles of fictional books that have made an appearance but didn't get too far with those. The French Lieutenant's Woman might point to Baltar and Number Six.