I think we're getting mixed up here. Different views of what constitutes a fighters 'biggest win'. MMA has moved on a lot since 1997, obviously, so regarding Vitor as a past champion should be viewed in the same way as regarding his biggest win is against Scott Ferrozzo. Which implies that using either fact to back up your own opinions of Vitor is kind of pointless. MMA wasn't even MMA back then. T'was more akin to NHB.
I used to be Tyson Fury but now I'm not.