Sitting at number 20 right now and looked up to see a TON of 0 wins 0 second place etc with a 100 ranked black belt. I'm... pretty sure that's impossible.
That or like, 10 wins and 0 everything else which I'm sure isn't enough.
Its a glitch in the leaderboards, I'm fairly certain most of them are legitimate. It seems to be more common in 2v2 if you play with a local partner.
Playstation All-Stars Battle Royale Accomplishments:
1st Ever rank 999 (only for full game, not beta)
1st Ever Double Black Belt In 1st 2 seasons (2v2 and Free For All)
1st Ever Black Belt (Acquired in Free For All)
1st Ever 2v2 Player to 300, 400, 500-1300 wins
1st Ever 2v2 Player to Black Belt level 300
1st Ever Free For All Player to Black Belt level 100
2nd Ever 2v2 Black Belt