I wanted to do Rasaad's questline, so I dismissed all my evil goons and built up a good/neutral party. (MC, Jahera, Rasaad, Anomen, Neera and Jan). Along the way, we did a few quests that raised our rep to Heroic (17).
Once Rasaad and the Soul Sun monks were done, I attempted to reassemble the Bad Boyz. I grabbed Viconia first, in order to drop my rep to a mere popular. Everyone else then came back into the group ... except for Dorn, who claimed I wasn't serious enough and to come back when I was.
I suspect the Rep of 15 is still too high for his liking; the question is, how low do I have to drop it before he is willing to rejoin? I can fill in his place with Korgan, but with his gear (the stuff from his Quest ... The Visage, the Abyssal blade ... not to mention the fact that I gave him Foebane, the Red Dragon armor and Dragon Shield ... Dorn is actually more useful, so I'd prefer to have him.