Don't worry, P.! I won't call him names nor threaten his future -- my concern was to keep him from sabotaging his future himself! As I said, I think that is diffused for the immediate issue, although I worry he doesn't fully understand and could blunder again. It does appear that his current behaviour is not an aberration, but just an extreme form of things that I've seen over the years which I now wish I had addressed more fully, although I guess hindsight is 20-20. I've had other students with similar minor blind spots, e.g., seeming to assume I do nothing else but supervise them, but such things are a common perception that students usually grow out of, especially when presented with explanation and evidence as I typically provide.
And I would be happy to argue WHAT goes into the paper; the problem had been his refusal to even let me know. It has finally been revealed to be hiding some perhaps poor decision-making, although at least now that I have full information, we can work together to present the work in the best light. I wish he had talked to me at the time, especially as I remember several long conversations about just the issue he was attempting to side-step. Oh well. The work is still good work and his results still valid, if the methods a bit less logical than one might hope.