Finally had time to capture images to upload. Here’s the view using USB Viewer - my ham radio has the devices listed under the highlighted “hub” entry.
Turns out - both FLRig and HamLib are using the same device, /dev/ttyUSB0. Here’s a screen shot from the configuration of CQRLog (which uses HamLib) showing the device configuration.
Note: rigctld is the “rig control” daemon library that is installed when the HamLib package is installed. Also - instructive to note that, under the “Extra command line arguments:” field, when using a USB-to-serial converter, HamLib needs to be told “how fast is the serial port?” with this command.
Hopefully, the images help with my earlier (TL:DR) narrative 
Eric