I didn't realize CITM is in DT. And seems to have 4:3 exclusions vs inclusions right now so it's either a glitch or somebody added an exclusion since the OP.
I don't think so? If we exclude you, then CanaryInTheMine loses your exclusion and moves to 3:3, giving him a net of zero and therefore included on DT2. So your exclusion is necessary to exclude him, which then means you lose his positive feedback on you. So the -1 would be accurate (I think).