Sorry I have never tried it, but I think what he is describing is:
- connecting the poly and mojo together using the two usb cables
- once the mojo has 'woken up' the poly, disconnect the data cable from the mojo, and connect it instead to your other dac
The post by JF seems to suggest that you don't need the mojo, if you use a power supply to wake the poly up instead.
In that case you then connect the poly data output to your dac using a usb cable.
The cost is only two usb cables, so you could try both options, and see which you prefer.