User blog comment:ChaoticCrush/Consistent Format/@comment-24142930-20131206001203/@comment-12720959-20131206182143

I think to justify writing it out is because we've already written "Level 499" so saying, "is the 499th level overall" would make it look a bit repetitive? That's just my opinion though, so as a solution I think writing it out makes it less mixed up. Plus, it stays consistent with "ninth level in [episode]" and "fifteith [level type] level".