Well, the MAC Address was only an example; I know they don't really have a "MAC" Address. I'm not so sure the board standing up is JUST for convenience, or if it acts like a DHCP Server (again, JUST an example), in the way that it assigns the controllers the address when the xbox starts up. But again, I have no idea why it does that. You would be better off asking the original creator of Yelo; but he/she hasn't talked about it for months now. If they would release the source code, there are many, including myself that would like to see if we could fix these small mishaps.