You’re welcome. Connecting Word Clock to the H9000 and setting the clock source to Word Clock would be the better option.
One option I can recommend:
- Connect HDX primary port to Lynx
- Connect Lynx secondary port to HD I/O primary port
- This is daisy chaining the first 2 devices, giving you 16 channels from the Lynx an 16 channels from the HD I/O
- Connect HDX secondary port to H9000 PTHD card primary port. This will allow you to use all 32 channels of I/O on the H9000 for 16 stereo hardware inserts.
With the above setup, the HD I/O and Lynx will handle all of your analog I/O, and the H9000 will be used for Pro Tools hardware inserts or aux tracks.
Here is a routing setup you could use to get 4 stereo pairs within an FX Chain. If you do these for each FX Chain, you can have a total of 16 stereo busses using the PTHD card (I’m using Dante in the example, but the routing is the same using any expansion card): 
