I agree that Darton did not design the previous cams -- and I also feel their patent would not stand up with a good patent laywer on the case because there is prior art. There is an old patent on a slaved 2-wheel bow that is cabled the exact same way, only it is wheels, not cams (thats what was shot back then.

And slaving the cams does not mean they wcannot be out of time, however it does minimize the effects of being out of time by preventing the other cam from continuing to rotate once the first one hits it's stop.