User blog comment:B214/Volume 22 spoilers/@comment-189.14.202.69-20161016140306/@comment-30006382-20161016192712

But still:"Has a better rating than Issei and his teammates, being the only person in Issei's team to not make a mistake in their game."... As a judge tiamat should someone who knows everything about the game and her being bina might explain why she [Bina] doesn't make a single mistake. TBH I expect tiamat, with how big of a game it is you'd probably want her to be a judge instead of random dude #2501), to be a judge thus I still believe that bina is a newcomer.