Just seen this on YT - not sure I would have the need to have a second controller as he Mavic is quite different set up to the inspire. He mentions a use for teaching, but they aren’t that difficult to teach if you are standing next to the person flying.
Seems a strange choice for a firmware update especially as it seems you can’t buy a second controller from DJI (yet!) but for those few out there with a Pro and Zoom, well something new to try 
