Oh, damn, that worked, lol. Little glitch/oversight with the hair during one of the later scenes, though. That ending with the brother was kind of dark, though. Robin really needs to go to AA.
Anyway, thanks. I wonder if it fixed things with Collin. I doubt it, but I guess I'll check. I don't think I saw any new scene in the memorabilia for him, so it looks like that solution is just Faust-related.
Update: I used the cheat code to unlock memorabilia, looked at "The Duet" and then went back to hang out with him, but it didn't work like with Faust, unfortunately.
Another update: *flips table* I GOT IT! I have no idea how, but I got it!