im not completely sure on this, but probably not. we are an OSDD 1b system with quite a few fictives, and some of them have sources thatre still ongoing! i say no on this because of the fact that that media didnt ever exist before- and therefore they wouldnt know that happened depending on the timeline of when they were in source after forming in the system. im iffy on this though, cause im thinking maybe itll unlock memories they didnt know about and theres also the fact that alters can know things that others dont; like languages or skills. dont take my word for any of this though im not all that familiar with this