Well, this all seems to be a bit random now. I put the computer to sleep, waited 15 mins and then tapped a key and saw, as expected, my disk drive had disconnected. But, this time, doing the "hotplug" thing, the disk drive reconnected. Strange. It wasn't able to reconnect in earlier tests. Anyway, I may have to prevent the computer from sleeping. That makes my cMP a little power hungry, but should prevent the dock from disonnecting.
Also, I've surmised that I must perform an NVRAM reset to get any device connected to the dock to reappear. After a straight reboot (no NVRAM reset) The Titan Ridge shows up in System Information and the TS3 Dock will appear both in the CalDigit app and System Information, but any device that gets plugged in afterward doesn't register. I'm kind of assuming that the AML isn't reloading or clearing out cruft on a straight reboot. I've included my config.plist in case someone want's to see what is being loaded with OpenCore.