I've had quite a few odd experiences in random groups throughout the game.
The other night, I was lurking around waiting for a dolmen to re-spawn and a Vr6 rocked up and asked if I wanted to group - so also being a Vr6, I accepted, as did a Vr5 who arrived. The first mush then disappeared and we joined them at a dungeon to find that the group leader was...Vr11. So, I'm thinking..eh? This guy must seriously be good to be able to take this on with players 5 or 6 levels below him. He wasn't!