Okay, first topic of discussion.
Is Regulus really dead?I don't think so. Why? Well for two reasons. The first is because it is over emphasized. Whenever Regulus is mentioned, the fact that he is Sirius's brother and that he is dead is brought up. Every single time.
Now, this tells me two things. One is that Jo wants us to remember his relationship to Sirius. Why? Not sure. There could be lots of reasons. The second is that she really wants us to believe that he's dead. Like Peter. Except, Peter wasn't dead. For that reason, I don't think Regulus really is either.
The second reason is because he was killed "off-screen". I get this idea from Peter. Like Lily and James, Peter was supposedly killed before the books. However, he wasn't killed at all. Unlike Lily and James, who we have twice seen proof of their death with Harry hearing them around the Dementors and them coming out of Voldemort's wand, we have seen nothing to prove Regulus's death but we've heard an awful lot about it. Just like Peter, the other death eater who came back to life. Even Barty Crouch Jr. kind of pulled the same stunt.
Dumbledore tells Draco:
Quote:
He [Voldemort] cannot kill you if you are already dead...we can hide you more completely than you can possibly imagine...
~HBP, US First Edition, pgs 591 and 592.
This is just before Harry finds the note from R.A.B.. Could it be, perhaps, that we are supposed to remember Regulus, regardless whether or not he is actually R.A.B. It would seem so, as he was mention so many times toward the begining of the book. If we were supposed to remember Regulus, might it also be true that this statement- which many have used for proving Dumbledore is still alive- is supposed to clue us in to the fact that the Order was hiding Regulus like this? And that perhaps Sirius had not been told because, at the time, Dumbledore seems to have though Sirius was the spy since he was advising James not to use him as their Secret Keeper?