Can someone please explain why there is any benefit to this ? The ECU has it's own battery. The ONLY power related issue with the CB200 is the fact that you must never draw more than a couple hundred ma from RX1 or RX2 which is why devices like the Cortex Pro (which actually connect to RX1/Rx2) recommend an additional power connection. There is no such restriction on any off the the other ports. I see no benefit or harm to having a secondary connection to the ECU but is don't believe there is anything related to the Jeti central box that makes such a connection necessary.

As for an issue such as defective throttle cable, such things are pretty easy to detect during maintenance and don't generally develop unless the cable didn't have proper strain relief, etc. Also, if the intermittent connection is the signal lead you could still have a flame out (throttle signal out of bounds) without ever having an issue with the power or ground pins so an extra connection wouldn't help in that regard. As I see it, if you can't trust your basic electrical connections in the aircraft then it basically isn't safe to fly as such an issue can develop with any cable in the plane and most of them could cause far worse than a flame out.