I don't think he's the Valeyard. I think he's the regeneration in-between McGann and Eccleston who committed genocide in the Time War, thus he wasn't considered to be "The Doctor" by any of the other incarnations. So Eccleston is still the 9th Doctor, but he's actually the 10th incarnation.
Plus, John Hurt's costume looks like a cross between McGann's and Eccleston's:
Plus, John Hurt's costume looks like a cross between McGann's and Eccleston's:
![[Image: 5QcmTTy.jpg]](https://images.weserv.nl/?url=i.imgur.com%2F5QcmTTy.jpg)