Which of the original loyal Legions does most use of Librarians? I know that the Blood Angels have Mephiston, but he is only one person. And I don't want to count the Blood Ravens, seeing how they are only a chapter from a later founding.

So, which one is it? The Dark Angels always seemed like they have plenty of psykers, but perhaps I'm beeing fooled because every marine wearing a hood reseambles a psyker to me.