I don't believe so when you are using a PPM link between them. I believe the PPM link may be fed directly into the primary receivers servo decoder so if fails to receive a valid signal but the secondary receiver has a good PPM stream then it should be able to use the PPM data very efficiently. How quickly the PPM stream from the secondary gets used once the primary fails to receive isn't clear. My GUESS is due to the nature of the PPM link being slower than the receive rate, the primary probably needs to drop several (2-3 ??) consecutive frames before using the PPM stream but it should to be way better than 14 consecutive receive failures which is the CB200 criteria for switching to Rx2
With the hardware available to the CB200 i see no reason why they can't make a huge improvement in the CB200s use of Rx2 without much effort. The question is, with all the other stuff they have going on, will they and if so, how long will it take for them to get around to it.