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I just read this today and was very impressed with it, figured I'd share.
[HBP]
Slughorn was totally RAB's helper.
RAB is probably Regulus, but Regulus couldn't've gotten the horcrux alone. So Slughorn helped him.
This makes sense because Slughorn was the one who told Riddle about horcruxes.
Also, I bet that before going into the cave, that Slughorn drank Felix Felicus.
[/HBP]


The pieces are coming together.