Yeah, none of those would be a single/primary source either, guess it's just not something I'm likely going to want. You going to buy one and send it in to Amir for some analysis?The TV would connect to the output. And source like an Apple TV, Amazon fire cube, bluray player, PlayStation etc would be the source.
In an ideal world the input would be HDMI eARC, and you would connect it to the eARC output of the TV in order to decode the audio from the TV. This would allow to use the multiple HDMI input ports on the TV as a multi-port switch, and use the TV remote to switch between them. Also in an ideal world CEC volume control commands would pass from the TV into the unit to control the volume in the unit. But it might be wishful thinking to expect these ideal features.