User blog comment:Zathronas/Analysis by an author: Volume 2 episode 5: Extracurricular./@comment-25358959-20140829142259/@comment-10390252-20140829200710

Correction: We only know for certain that they are targetting one specific student. We have no idea whatsoever who else they might be targetting beyond a reasonable assumption it is those whose Semblances are somehow tied up in their fighting tactics.

I suppose it is possible that they are aiming to recruit more dark apprentices but that wouldn't fit with the fact that they were discussing weaknesses too.