Got to admit, one must love the attitude of "be careful what you ask for".
Zeus: Buddha, you fight next round.
Buddha: OK.
* On the ring:
Buddha: I fight on humans' side.
That said, I'm pretty sure the fighter on the God's side will be either one or all of the "Seven Lucky Gods". (They might be considered as one, for some technical reason. Fusion?)
I think this based on this whole chapter which seems to be one big foreshadowing for this line up.