Did he turn into a god that participates in the games?

No, he's still a player but just gained access to watch those "gods" after going back.

Honestly, that's an interesting theory. I thought about it too. (๑•ㅂ•)و✧

i mn, he might end up being a god-killer to be exact. in the first chapter, he wanted to go through the “black-hole portal” that opened up that allows u to contact god.
He couldn’t go cause he was an avatar so if in this second chance of his, he is not an avatar, then he can go through the portal and kill them off.