Not really a contradiction; way I read it, Beastar is a title that can be awarded every graduation (though it usually doesn't get awarded, due to a lack of qualified candidates). It's pretty much a title that sticks with you unless it gets stripped for some egregious behavior. If you look at it that way, at any given time, there's probably 20-30 of them about at any given time, doing various things. Most probably aren't doing a superhero schtick, kicking people around though.
...Or maybe I'm totally misremembering what was said about it, making my ramble entirely pointless. Wouldn't be the first time.