R.A.B. and the Big Switcheroo

Hat Tip to Felicity/Maureen for pointing out this great theory from another sleuth, David Camillus. The gist is that R.A.B. is Regulus Black and that he pulled a switcheroo on the lockets before the fake was ever hidden. Felicity pointed out to me in an email that the theory Explains why the fake locket was at the bottom of the basin covered in the poison, apparently undisturbed, and Eliminates the problem of explaining how one person could have managed to cross in the boat and drink the poison. Professor Mum posited in this post that Bellatrix may have been involved in the task of placing the Horcrux for Voldemort. She cites Bellatrix's quote in HBP Chapter 2: "The Dark Lord has, in the past, has entrusted me with his most precious--if Lucius hadn't--". Felicity concluded: "Voldemort gave the diary horcrux to Lucius, so there is no reason he wouldn't have given the locket to Bellatrix." I feel like Dr. Watson surrounded by all these detectives. This theory made me ponder something about the nature of horcruxes: does the creator of a horcrux have to get away from his horcruxes for some reason, i.e., do the bits of soul cause pain to each other in close proximity? It does seem odd that Voldemort wouldn't take care of really important stuff like stashing a horcrux by himself. Of course he always hangs out with that silly snake which Dumbledore seems to think is a horcrux. Someone somewhere pointed out that if the diary horcrux had succeeded in taking bodily form in book 2 that version of Tom Riddle probably wouldn't have been very good friends with the reinvigorated Voldemort of book 4.