Tiny Chat People

If we're going to stay alive, which we should for the meta reason of "it would be a shit way to end the story" if nothing else, then we should justify our existence.
We can make things better, so we should. We should care about the well being of all of the cats, not just the ones that happen to be ones we made.
Averting any cat from being harmed through avoidable conflict is very difficult to the point of probably being impossible, undermining the authority of the other gods who would intentionally send them to die and harm others in battle for reasons that do not materially affect the cats at all by using our cats as diplomats is a real moon shot plan, but it serves a means good enough to justify our existence.

If they got themselves in danger trying to do the right thing after we were gone then frankly, I'd count that as a success.
What's the point of us otherwise?

You make a fair point.

The only real problem with using the cats for diplomacy is that we might need a controlled environment to convince the other teams (using Windy's Teaching skill to teach them things and perspectives their gods might not have - like cult deprogramming), and we don't have the catpower to capture and contain everybody else's cats at once to do that. If we try to do it right in front of their gods they'll just get orders to stop our cats.

Had we not brought Wax into the equation, I might say Macaron would be a good ally for this plan. She doesn't seem like the type to enjoy the fighting either. The possibility of recruiting both Marzu would have been there too. 3v1v1

It's not a bad ambition, but I'm not sure it's a realistic goal anymore.

I'm still not gonna make commands since I've fucked up enough, but I'm gonna drop my two cents on this situation.

We could, I think, turn this into a 4V2.
Marzu doesn't want to team up with Rein because he unsettles him. But if we can team up with Macaron and Rein, Wax would have to join Grind's team. And Wax seems to be a rather unpleasant person. Not just because of how he acted towards us, but also because Macaron didn't want him to enter the game. With luck Marzu might be willing to team up with Rein just to avoid being stuck with Wax.

Despite my reservations about Rein, this idea does have some sense to it. I'm just not sure yet whether it's worse to be on Wax's team or against Wax's team.