Harry Potter fans: plot hole regarding the Elder Wand?

I see what you are saying but Voldemort has not stolen the wand from its owner, that is the key to the Elder wand and it's 'power'. Ownership of the wand transferred to Draco moments before Dumbledore's death so it is his. In every case the theft has been from the owner of the wand. That's how I see it anyway?? :)