I've received as gift a shiny new Pi Zero and decided to use it with my old Toshiba dynadock.
The result was not just proof of concept, but quite nice mediacenter which setup take me ~15min:
Dynadock comes with 5A power supply and have 4 rear and 2 front USBs. The front USBs are always powered and I've used one of them to power the Pi. On the rear you have Ethernet which works fine with OpenELEC without any extra settings. In the above configuration I also add 1.5T HDD, BT dongle (for my 8Bitdo FC30 GamePads) and Unifying receiver.