Sacred Haven of Debauchery

Can I watch them explode into pieces, struck by the priest's banishment?

Mine obeyed, for perfectly understandable reasons (it was especially fun with liches, who killed themselves with their own magic).

And why would I need this kind of gameplay that wasn't really intended by the developers?

I don't know, I tried to stun him out of principle, but I couldn't and gave up, and then I just killed him out of curiosity.

If you remember who's who, you can see from the portraits that I have at least three good units in my team.

I didn't notice.

Maybe they only left him in the trilogy for the sake of making it easier to min-max.

No, they definitely didn't. Although, there aren't that many artworks available, by the way, about min-maxing.