I think I get what your saying. I hadn't considered it that way. But if I get the gist of what you said. That if you configure the flight controller to handled everything including gimbal ops then when it reads the FC it pulls in those settings.
I will have to read more on the subject. I have never configured for instance the Gimbal to operate via the FC in anyway. Its always been on a separate channel unrelated to the flight controller.
I wonder then if this is why some flight controllers have an SBUS out. Is the flight controller in someway manipulating the SBUS signal to operate peripherals.