Interesting debate. I am in the "ninth incarnation" camp.
Sorry to go slightly off topic but why does this thread say it has a spoiler? There is nothing in here that wasn't broadcast on televison. We are merely having a debate about who Hurt might be. I only ask because I wanted to ask a few questions of my own and I'm not sure what is classed as a "spoiler", (I thought it was anything that is known but yet to be broadcast, ie not what this thread is!)
Because the episode just aired over the weekend, and some people might not have seen it yet. The spoiler warning is a courtesy.