Now i'm not saying Sivir is first confirmed Non Heterosexual Champ.

But i am saying they have a good foundation to at least let that become a legit interpretation.

Think about it, Cass is most famous for using her feminine wiles to manipulate people, and she played Sivir pretty hard, So yeah just saying, it may look good on Riot's record if they can say they were letting it be ambiguous while making sure it was OK to make official.

All at little risk.