Dragging another God into the mess will achieve victory in the sense of "Permanently disrupt ritual." It will probably escalate into GOD FIGHT and some hardcore magic being thrown around, but it won't reach TWOTG2 status.
So far, the Gods actively watching are -
Shin, who actually gave the combat blessing to all of his followers (except the Savoki fakers) just because he likes the violence. He doesn't care who wins, but may manifest as a warrior if the fight gets interesting. Or too boring.
Pantxike, who made all buffs from one god apply to all followers of that god, regardless of enemy or friendly, because it amused him. He sort of wants Myrln to not die, unless it'd be funny. Which it might just be.
Coranthiir, who is empowering the High Priest. He DEFINITELY wants to lay the Hammer of Righteousness all over everyone and sort out the bodies later.
The Gods who are watching but have not acted are -
Chelan, in case of SERIOUS GOD FIGHT, to violently smack it down. He does not care about the fight in the slightest, and will only interfere if the manifested gods get serious about the fighting.
Mingan, because it's a clusterfuck.
Liagora, because Shin may manifest and start fighting for one side or another, and she'd join the other side just to fight with him.
Eyilana, because she saw it coming and there's MANY possible timelines from this moment.
Darsh, because it's a chance to fuck with Coranthiir and there's some followers of his there.
Savoki, who may or may not empower his followers, depending on how brutal they are. Doesn't care about the victors, just the fight and blood.