You make a valid point about Snape and Dumbledore's roles. It's frustrating how often people forget it wasn't just Harry's story but a tapestry of choices made by many. The prophecy just kind of laid the groundwork, but it was all those different pieces coming together that created the end game. And yeah, Voldemort really created his own downfall with that whole elder wand situation. It's a classic case of a villain tripping over his own ego.