It's hard for me to say tbh. I only kind of remember D1 (again, I had a complete brain crash pretty early), and there isn't that much back and forth in the QT for me to reread. From what I remember, he felt like Dan was being dismissive of cases and cared more about looking town than finding scum. His complaints on Dormio were that he was really reportery and didn't say much. He thought the former was worse than the latter.
It may also be partially my fault. I 1.) didn't want my opinions to color his too much and 2.) was having trouble reading the game. Once he gave some opinions on people I was willing to give some of my own, but not before. He gave opinions on Dan way sooner than Dormio, so he got my opinions on Dan way sooner. I really did not like Dan D1. I still don't like his posts and I'm really only clearing him because of the counter-wagon thing. Dormio I had a much less solid read on. His D1 posts always confuse me, so I did what I did with him in every other game I've been town in: ignored him completely. So, it's also very possible that because I had solid opinions on Dan, but not Dormio, that he thought Dan was more likely to be scum.