Okay, so Lone Wolf and Dark Horse both have "limit 1 per investigator" on the cards. The two interpretations of this I can think of is 1 per investigator in play OR 1 per investigator deck. I think it means in play, which would allow you to have 2 copies in your deck. Any thoughts that would contradict this?

unless otherwise specified (such as the Exceptional trait, Signature cards) text on cards tells you how to play the game with them, not how to deckbuild with them. They are subject to the normal rules (2 per deck).

That's what I thought, just bugged me for some reason. Nice to have confirmation.