Is it just me, or do souls not reincarnate as demons after death? Sinners are one thing, and demon overseers are another. All sorts of beasts (nightmares, imps, demons) in the faction fit the concept of demons very well. I don't understand why they added non-demons, that is, torturers and maniacs. They really look more like people. And in the demon faction, people don't quite fit :p. For the same reason, a militant scientist-demonologist cannot be added to the faction. And if as a neutral, it will be just another example of copying from King's Bounty.
Inferno has become more like Disciples 3, and if that's the case, they could have added it. The entire 6th installment turns out to be a collection of different games :D.