Staff post in blue, MVPs are just regular players who are helpful and offer knowledge and experience. There are plenty of non green posters who do that too.
Edit, found the sticky, I was being blind and couldn’t find it -
I have merely tried to explain why the deserter buff is needed and what happens when it doesn’t exist.
Just about everyone is going to say they don’t like getting a 30 min (or shorter) deserter buff. I’m not sure what help that data would be. Most people will also claim they are innocent even if the rest of the party thought they were misbehaving 