Ok, Waynegg, I will try to explain it how I see it. I didn't write the tell, but here is my interpretation.
You have to understand that the word "we" can have different meanings depending on the context. You can say an all inclusive "we" like we-everyone. You can also say we-you+any number of other people. For example if you and I agreed on a specific subject and you were writing about it, you would use the word we (ProHawk and I). Using it this way would not be a scum-tell because I would have already posted my thoughts and you know yours thus we would be an acceptable use of the term. Context of when a player uses "we" is crucial.
Look at the example "We think XYZ is scum because of ABC reasons". Unfortunately the example doesn't give much in the way of context, but I think the only way for it to be an actual scum-tell is if someone uses we ambiguously (like you wouldn't be able to tell who the "we" includes). The person would have to be unconsciously referring to the we-scum team.
All of DC's uses of "we" that you pointed out are clearly referring to we-everyone. The way he used the word "we" is not a scum-tell.
Plurality
"We think XYZ is scum because of ABC reasons" Note the use of the word "we". A town player is alone. If you use somebody using the word "we" or "us" chances are you've found scum. Please note that this read is null if the player claims mason under duress. Still, keep it in mind. Especially if the town already had a pair of masons claimed or dead.
Strength: 60 (90 second instance, 100 third and beyond)
You have to understand that the word "we" can have different meanings depending on the context. You can say an all inclusive "we" like we-everyone. You can also say we-you+any number of other people. For example if you and I agreed on a specific subject and you were writing about it, you would use the word we (ProHawk and I). Using it this way would not be a scum-tell because I would have already posted my thoughts and you know yours thus we would be an acceptable use of the term. Context of when a player uses "we" is crucial.
Look at the example "We think XYZ is scum because of ABC reasons". Unfortunately the example doesn't give much in the way of context, but I think the only way for it to be an actual scum-tell is if someone uses we ambiguously (like you wouldn't be able to tell who the "we" includes). The person would have to be unconsciously referring to the we-scum team.
All of DC's uses of "we" that you pointed out are clearly referring to we-everyone. The way he used the word "we" is not a scum-tell.