I wasn't very clear. If the photo shows a 2 channel interface, I see 6 wires = 2 x servo link (+ - data). You can have just 1 'complete' wire for channel 1 to power the RX, and just add the data line for every next channel. For 4 channels the breakout wiring would 1 complete (3 wires) + 3 more channels = 6 wires. Hope this makes clear my suggestion.