Dumbledore- parseltoungue, odd acts... Impostor?

Dumbledore, Parseltongue, Horcruxes, Impostor &… R.A.B.

Initially, I thought it was just my own awry imagination when I found Dumbledore a little strange in Half Blood Prince. But then, a solid proof rattled me.

In the memories in which Bob Ogden goes to meet Marvolo & Morfin Gaunt, the conversations between the Gaunt father and son takes place only in parseltongue. Harry Potter initially couldn’t deduce why Ogden was not able to understand what Morfin was saying, but then with Dumbledore’s help he realizes the conversation was in parseltongue. Then there is the memory in which Tom Marvolo Riddle goes to meet Morfin, finds that Marvolo is dead, and then proceeds to kill the Riddles. In that memory also, the conversation is in parseltongue; parseltongue being a rare gift of dark wizards. But not once during either of the memories does Dumbledore ask Harry to interpret what was being said in parseltongue, and shows signs that he was perfectly understanding what was being said. Now Dumbledore, a Parselmouth?? A property never attributed to him previously…

If Dumbledore was indeed Parselmouth, Harry didn’t see him using his gift in six years of knowing him. And why didn’t he use his hidden talent to destroy the chamber of secrets. It would have been a piece of cake for him to open the Chamber of Secrets (after all, Big V had opened it at the age of 15), and blow the monster of Slytherin into smithereens. But he didn’t do so.

There are other subtle evidences of Dumbledore’s odd behavior. In the chapter, Lord Voldemort’s request, Dumbledore shows his own memory of Voldemort’s interview in a bottle?! Why didn’t he take it fresh out of his mind, like he used to do in previous books?

There was one more thing. Dumbledore is always portrayed as a pillar of modesty, and never praises his own talent. But in HBP, there are many cases, when he, in his meetings with Harry, calls himself very intelligent, skilled, powerful, influential and so on.

So, apart from mild case of his memories in bottles and boastful nature (which might be his habits), there is his being a parselmouth, a major thing. It might be a glitch.

But suppose this all points to a big fact- the Dumbledore from whom Harry took classes was an impostor! Maybe he was giving the classes when real Dumbledore had other important things to do.

But Dumbledore got himself a substitute who could speak parseltongue! The impostor also knew a lot about Voldemort. Through these, the duplicate appears to be of an extremely pure blood family, and one that is closely related to the dark arts.

Do we know of any such families? Blacks or Malfoys or Lestranges, perhaps. But no one from these families has been against Voldemort, except from the Black family.

Who was the Black member who became a Death eater turned traitor? It was Regulus Black, the alleged R.A.B. it is known that he was killed not personally by Voldemort, but on Voldemort’s orders. Maybe, he faked his own Death just like Wormtail. It can be that he was helped in faking his death by the kind Dumbledore, who asked him to return the favor after many years, in the form taking his place.

I think that the real Dumbledore or the fake one (R.A.B.) took Harry into the cave (previously discovered by R.A.B. to steal the Horcrux) to give him a glimpse of the dangers involved in destroying Horcruxes. The fake Dumbledore himself replaced the Horcrux with the fake one containing the note. And the real locket must be in No.12, Grimmauld Place. JKR talks about a locket in the chaper The Noble and Most ancient House of Black, Pg 108:

A heavy locket that none of them could open;

I know the theory that Dumbledore was substituted by an impostor, and that too none other than R.A.B., is quite lofty but not utterly unconvincing.