could someone explain again how harry came to be the true owner of the elder wand? confused a bit on that one.
Gridewald: defeated by Dumbledore
Dumbledore: disarmed by Draco atop the Astronomy Tower *before* Snape cast the AK
Draco: disarmed by Harry during the escape from Malfoy Manor (when Dobby was fatally wounded)
At least this is what JKR's reasoning is. Personally, I think the idea that Harry disarming Draco of his regular ward (not the Elder Wand) at Malfoy Manor is a bit of a weak link - the idea being, I guess, that now that Harry controls Draco's wand, he controls all other wands that Draco might control? Personally, I'd have gone with "Draco controls the Elder Wand, and kills Voldie" or "Draco controls the Elder Wand and so Voldie can't use it, and Harry kills him with Draco's wand, which works perfectly fine and doesn't share a twin core" but I'm not JKR, am I?
I suspect it was all leading up to Harry being able to use the Elder Wand to repair his holly and phoenix feather one at the end - as well as setting up the ability to make Snape's death utterly. effing. pointless.