No... as I said, it's like I've got an 8-speed groupset now. Will connect my 8050 mech to the shifters on this bike but given it doesn't shift when connected to the other di2 bike, I doubt it'll make a difference to the mech.
Anyone know if the RX805 mech will fit a 40T cassette like 8050 does?
Does it shift into them when in the big ring?