I have a Yun Rev 2 and a Braccio arm shield. The Braccio shield has a switch for its power supply to provide power to the Arduino via "Vin" or "5V". Obviously "Vin" no longer works for the Yun Rev 2. Do I dare risk providing the Braccio power to the "5V" pin on the Yun Rev 2, or just stick with also needing USB power to the Yun board (as well as the Braccio arm shield power supply)?