So I only have the sl inf fans, but from the pictures I've seen, you need to use both controllers if you want to use the fans from the aio. If you use inf you can use everything from the controller that came with the fans. So that's what I've seen so far on pictures of the aio.
In my opinion, the controller of the aio is only necessary with the fans of the aio. I hope I was able to answer your questions halfway. Have a nice evening.