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How bizarre! Cheers, do you know if the cables and batteries work for both 10 and 11 speeds?
I know, I was quite surprised when I tried to get a replacement 10 speed RD for @Cycliste's BMC. I ended up upgrading my TT bike to 11 speed and using the rear derailleur off that on the BMC, as it was no more expensive to do that than to buy another second-hand RD.
All the eTube non-7970 cables and batteries are interchangeable. All the 10 speed stuff can be used with 11 speed FDs and RDs.
Nope. Due to their rarity, 6770 rear mechs are more expensive second hand than 6870.