Kofusachi transmits to everyone in the conversation, except Nethys who already knows, a copy of the relevant parts of his decision-making process.
Long ago, when Kofusachi was first a god, Abadar approached him with an offer for trade. They had shared interests, far more so than Kofusachi has with any other god. Abadar would advance them in the Inner Sea; Kofusachi would advance them in Tian Xia; both would benefit from specialization, not having to duplicate effort, not spreading themselves too thin. As part of the agreement, Kofusachi agreed to value contracts and the rule of law more than he would naturally, and Abadar came to value wealth untraded more than he naturally would. If there are two gods who can trade, not just in matters of instrumental goals, but in matters of fundamental values and morality and ways-of-seeing-the-world, it is Abadar and Kofusachi. In a certain sense, that is what they are all about.
In spite of that trade long ago, they are still different gods, and there are some things that Kofusachi can see better than Abadar.
One way you can talk about Chaotic Good-- a way that is incomplete, but that has some valuable truths in it nonetheless-- is that Chaotic Good is about asymmetric weapons, tools that Good can use but Evil cannot. Asmodeus thinks of Cayden Cailean as the silly party god who ascended by accident, because Asmodeus doesn't understand the power of laughter, and that is why laughter has a power to puncture him that few things do. Asmodeus tolerates Immonhiel treating mortals in his borders, because he thinks of it as a foolish Good god advancing Asmodeus's goals because she is too sentimental to see where her self-interest lies.
In this frame, Kofusachi's asymmetric weapon is selfishness.
Evil thinks it has the monopoly on selfishness. But it is not an accident that Elysium is a much better place to live, on a strictly selfish level, than the Abyss or Abaddon or Hell.
Kofusachi says: you should be happy and free and be able to do as you like, as long as it doesn't hurt other people. And if you are happy, then you won't lash out from your misery, tearing someone else apart to try to ease your own pain or because if you are hurting so much then someone else should have to hurt to. And if you are free, then you will grow and create and take risks and make something new and beautiful in the world that wasn't there before. If you do as you like, you will discover one of the things you like is making people happy.
If you have climbed up the mountain, your hands bleeding and your knees scraped and your muscles tired, and you've seen the sunrise over it and the world spread before you and you realize that you are okay now, the struggle is over, then the first thing you're going to do is throw down a rope and help someone else up.
And Kofusachi's weapon is always there. You don't have to make any grand pitch about perfecting the universe or the equal worth of all human beings, to get people on the side of Kofusachi. Even Evil people want to be happy.
Kofusachi loves trade, because the thing that trade is is that everyone involved acts in their own self-interest, and the thing that comes out of it is Good.
Kofusachi does not like disease.
Pain and grief make people cruel: the sharp-tongued words that come when your body hurts so much you can't think, the anger at a child for not being the one that died, the repression of the love you feel for you child so it won't hurt so much if they die, the bone-deep tiredness that means that even the most well-intentioned person neglects those they love. And sickness makes people poor. Families buy medicine instead of cows or better roofs or food for the children. Sick people can't work, so fields go unplanted, and shoes are poorly made because the shoemaker is too ill to keep their hands steady. Sick children are too bedridden to go to school or their apprenticeships, or too brainfogged to learn much once they're there. The family wage-earner dies, and the children beg on the street, and that matters not just because the children are miserable but because if their parents were alive they would become farmers or merchants or wizards and make everyone's lives better in ways as impossible to track as the ripples in a pond.
This is the sort of thing Kofusachi is shaped to see, more than Abadar is; the tremendous waste that is disease, the drag it is on all attempts to make the world better, every investment and every festival that is sacrificed to malaria and the pox, to ameliorate a tremendous suffering that should not be at all.
The other major reason Kofusachi is here is that Abadar gets along with Asmodeus well enough, because Asmodeus always follows his agreements. Kofusachi does not get along with Asmodeus.
Kofusachi really, really fucking hates Cheliax.