The Eclipse can be set up to put its two output channels on any of the 8 ADAT channels, leaving the other 6 channels either muted or unchanged. It can also receive its input from any of the ADAT channels.
This means that you can daisy chain the ADAT through the Eclipse, if I understand you correctly. You would probably want to use Wordclock as the sync source.
See page 27 of the Eclipse Manual for more information.