There's two blue coloured usergroups; Advisors and Administrators.
I don't believe having another blue coloured usergroup would be the best, so I decided to give them a username prefix but keep their usergroup colour white. It works out better, considering their group header image has blue text. It's not a mistake either.
If they didn't have it then it wouldn't look right. All they would have is a userbar, and all the userbars look the same.