Reviewing the pictures again, it does appear that you selected the Buchardt DLNA renderer (as you stated) rather than the Buchardt Chromecast renderer. While they both appear on the phone, apparently only the active renderer is in the MC server Playing now zones, as Bob described above (since you have not deployed BubbleUPnPServer on PC).
You may find that Chromecast is limited to 16/24 bits, up to 96 KHz, no gapless if it is constrained by the original Chromecast Audio specs. Within these limitations, I have confirmed the BubbleUPnPServer over MC is bit perfect playing to original CA dongle.