Posts by matuson palmerson and lampaster are mainly identical. The same style, length, use of words. You could PM them and show them this thread, but I also doubt they will come here to explain anything. Is red well deserved? Maybe not from you or me, but yahoo should step in.
I'm probably one of 5 members of the forum who are doing this kind of investigations (without any payment) , 99.9% of members doing nothing or don't care about it, as well 80%+ of DT members don't care about tagging them so someone has to do it.
You've made some good research which provides strong circumstantial evidence to back up your assertion, and you've left what you consider to be appropriate feedback which, seeing as you are DT1, publicly marks the involved accounts accordingly.
I'm personally not a fan of duplicating ratings simply because they are left by other DT members, even though I may agree with them.
Have you made Yahoo aware of this thread and its findings?