Akoya is on the short list of people that The Sinner has even the barest intention of listening to. Here, I will show you The List:

1. Akoya
2. Maybe that Fuu girl

So...that's a lot of power he has indirect access to.

Also, I will just throw this out there: Akoya's some kind of villain, right? Wants to destroy everyone not beautiful? The Sinner's cultural background is such that they see absolutely nothing wrong with this.