Hmm, methinks there's more to that dagger than either Draco or Pansy know and that lack of knowledge likely will come back to bite one or both of them; though I suspect it may imperil, at least temporarily, Hermione or Luna.
I have to wonder about Agathon, is he really not watched that closely or are the rest of the Brotherhood watching and giving him enough rope to hang himself? For that matter, I have to wonder if he's really trying to separate the Brotherhood from the wizarding world or if he's trying to cover up that he gave Riddle information on horcruxes?
I will admit, I do wonder what interesting events a Ginny in Ravenclaw may get mixed up in; it should be a most "interesting" year.