Okay so first, we need to make a couple of assumptions. The first is that the villains stay true to their nature and their skill sets. And the second, is that they all can lose.
The biggest potential issue we have with the "they all can lose" part, is with Hades. See, Hades is a God and immortal. Soooo...not sure how we involve him in this fight. I'm thinking that really defeats the whole purpose of the games. Either he has to have a mortal proxy, or he can't play. I sugges...
Also read: Aleppo siege: 'We are crying and afraid'