Point taken, thank you. A quick question while I'm here. I just ordered a 10 speed replacement link (CN-RE400) and each one I saw had solid connecting pins. Do they make any with hollow pins similar to record chains?The 11-speed RD for Chorus and up changed for 2015. 11-speed has been around since 2009.
I have proved to my satisfaction that a 2009-2014 11-speed RD has the same actuation ratio as any 10-speed RD. Cannot speak for the current design, although I'm always sceptical of Campy's suggestions of incompatibility.
Perhaps if you were more forthcoming and detailed in your original question, there might have been better answers.