Lots to unpack. Still re-reading your response. Not trying to reinvent the IK wheel or anything… just trying to get minimalist arm swing for that stupid “floss” dance where the arm just swings like a pendulum with no other arm movement.
I have near total ignorance of FK, so hopefully not just asking nonsense: Are you just disabling the IK then, or referring to something more specific built into the rig that specifically EN-ables FK? (Been busy with weights, etc so not much chance to dig into controllers yet).
Are you still just using the same controllers in FK scenario (as opposed to, for instance, animating shoulder joint rotation)
Also trying to wrap my head around the lack of controller hierarchy in some chains. For instance, if you wanted the head to follow the neck, would you change the hierarchy to make head controller child of neck controller, or did I miss some other option that enables this?