Are there any legends that have been banned?
iTemp has been banned a lot during his course and so has Felnin so I'm not sure if they allow people who have been banned a lot to be legend.
But yeah I do feel like there should be at least one legend who is a GOD at the game. Also Jisse has done more stuff for the community than either Diamond or iTemp and that's what Legend is in Toribash, doing stuff for the community.
PS I guarantee there are duelers who have fully quit, I don't know any on the top of my head but there was certainly a dueler in like 2009 who quit and never returned.