User blog comment:Western Gen/Speculations for Season 13/@comment-83.254.56.86-20150616125849/@comment-178.219.97.150-20150617171117

I think I know a reason. It's O'Malley. Doc wouldn't have gone crazy by staying in the same dimension. And because of that he's O'Malley again, it means he's not a pacifist. Therefore, he will help in fighting off the Pirates, either by joining the people of Chorus or by trying to kill anyone he confronts.

Don't judge a book by its cover. At least that's how I see it.

But, yeah, it wasn't the best way to bring Doc back...