Sounds like the best scenario would be to connect your DP88(s) via ADAT I/O on your Quantum 4848. This would give you control over the DP88 via Universal Control. The clocking would sync over the ADAT connections. Make sure you're routing your ADAT cables from Output to Input and that you have connected at least two ADAT cables per DP88 (4 cables for 96kHz SMUX). Word clock would not be necessary as long as your DP88 locks to the incoming ADAT connection.
Seek page 7 of the Quantum 4848 User Manual for a diagram of how to hook up 2x DP88s and 2x patchbays. It's a bit of a mess, but trace the red ADAT connections to figure out what to do.