I'd much prefer it if John Hurt's incarnation was a militant mad-man, drafted into the Time War and forced to do all sorts of unspeakable acts out of obligation. Then, near the end, he regenerates into Eccelston who then uses the Moment to do what needed to be done, deciding to do it because
of all the things the John Hurt incarnation was forced to do.
It would much more fully explain why Eccelston's incarnation was so PTSDy, far more than just
wiping out his own people. And he wouldn't be lying when he said that it was him
that did it, as opposed to a disavowed incarnation of himself.