Seems that this should have cleared itself up when the HE rebooted after installing 2.2.1.113 subsequent to doing the ZEN16 firmware update:
The Force Remove that I had to do after unsuccessful multiple excludes (see above) did remove the device from the HE device list, and the device reappeared with the new firmware number after I factory reset the ZEN16 and re-added it to the HE. Again, see my report above.
So, in view of this prior post linked above, seems everything should be OK.
