Thank you, Nico5. I very much appreciate the detailed reply.
Yes, you understand correctly.
I do have 2 ADAT cables going from the OUT to IN and IN to OUT on the ES and MOTU.
All 16 channels are set up as Cubase inputs.
I am not getting a signal from the ES in the MOTU mixer software (Cuemix). But I am getting signal for all 8 MOTU 8Pre inputs.
Sync/clock for the MOTU is set to internal. Not seeing a way to set the ES clock.