Hi John,
Adding a Clock to your setup would improve the sound quality when playing from Roon (or another streaming service). It will mitigate sources of intrinsic jitter in the DAC, improving performance. (You can read a bit about intrinsic jitter here if you are interested)
This is true even if you are playing from an asynchronous source such as Roon - even though the source does not need to be clocked per se, using a dCS Clock into the Bartók still works to reduce intrinsic jitter.
I’d definitely recommend having a demo of the Bartók with and without a Clock when streaming so that you can hear the difference for yourself.