[Kevin Selavko]

Find it highly unlikely that only one port on your sidecar will fail and in a way that it would not interfere with the signal from a second. I also don't know how well the controllers would like having two signals sent to it all the time, Im guessing that the signals would not be exactly the same. Also I think it to be more likely for your pwm y cable to fail more than any port on the DSC, and adding to the number of pwms connected to each other will increase the probability of a connection coming loose.