I mean: Is it enough evidence for people within the story to conclude that he is Voldemort? Being a ridiculously powerful dark wizard should be enough for them to locate the hypothesis and consider it a possibility, at least for those who know that Voldemort is alive. Then there are other clues: his attempt (with Harry) to free Bellatrix Black, knowledge of the Death Eater password (among him & Harry), his strange relationship with Harry Potter (including the odd magical interaction & Harry's sense of doom), and his ability to turn into a snake. Is that enough evidence to convince someone like Dumbledore who already knows that the Dark Lord lives? Is it enough for the rest of the wizarding world to be persuaded?
that depends on whether they still trust harry after this... If he gets out Draco is going to figure it out for sure, dumbledore and mcgonagal I am not certain about, and the wizarding world in general? I would say not a chance, but it opens up some interesting possibilities for the story if the wizarding war erupts out of nowhere again so quickly.
[Update: and now there's a fifth discussion thread, which you should probably use in preference to this one. Later update: and a sixth -- in the discussion section, which is where these threads are living for now on. Also: tag for HP threads in the main section, and tag for HP threads in the discussion section.]
The third discussion thread is above 500 comments now, just like the others, so it's time for a new one. Predecessors: one, two, three. For anyone who's been on Mars and doesn't know what this is about: it's Eliezer's remarkable Harry Potter fanfic.
Spoiler warning and helpful suggestion (copied from those in the earlier threads):
Spoiler Warning: this thread contains unrot13'd spoilers for Harry Potter and the Methods of Rationality up to the current chapter and for the original Harry Potter series. Please continue to use rot13 for spoilers to other works of fiction, or if you have insider knowledge of future chapters of Harry Potter and the Methods of Rationality.
A suggestion: mention at the top of your comment which chapter you're commenting on, or what chapter you're up to, so that people can understand the context of your comment even after more chapters have been posted. This can also help people avoid reading spoilers for a new chapter before they realize that there is a new chapter.