So the Flex dock works now after a second visit but they have managed do damage my dash. I wouldn't advise anyone getting this done. I wish I hadn't bothered! When the Flexdock is installed it disables your lower usb. It will only work when you remove the cradle by pressing the button on the dock. Weirdly the lower usb will charge your phone when the engine is off
I was thinking the same jim to be honest the only thing i can think of it so your phone doesnt slide about when its plugged into the usb, and its a bit easyer than fiddling about for a cable i suppose.