It sounds to me that we were talking about this topic in some other meta thread about this. I'm sure LoyceV participated in the conversation, so I'm guessing he'll come around here to comment.

I'm not sure about subtracting exclusions. What I would be fine with is if there were two instead of one inclusion by DT1 to be DT2, I think it would reinforce confidence, and at the same time reduce the number of DT2 that I see it a bit long.