So I was able to mount the X3/X5 Camera Plate on top of the M600 so that I can use it as a FPV and still be able to use the Ronin MX with a Camera attached to it. I got video stream from both the ronin mx and the x3 by plugging in the x3 to the gimbal port in the lightbridge 2. But I noticed that it only lets me have control over the x3 Gimbal. I cannot use the ronin mx Gimbal, remote start/stop or have focus control. Is there a setting that would allow me to let the slave controller have control of the ronin mx functions while using the X3 as an FPV camera?

M600 series do not support dual gimbal. Since you have installed Ronin-MX on M600, we do not recommend you to attach an X3/X5. Currently, only M210 and M210RTK support dual gimbal camera.