Main reason why I think Okita will lose is because Okita was said to have never lost a battle:
His first L being against the God of Trickery and a mainstay in the audience makes sense to me imo. The only god that has been there from the beginning(Zeus, Ares, Odin, Hermes,) that will die is Odin imo.
In mythology, Apollo was a mighty enough fighter to beat Ares in a fist fight lol, but I can see him being an over confident douchebag that falls to Simo, but we need to wait and see.
Who do you think he will fight against then? Susanno?
I think it could go either way with Tesla