So I could run the tv sound via WiFi and it would have no delay or the bar does not accept sound from the tv via WiFi and only arc or hdmi? Thank you!
There are two concepts at work here, bonding and grouping. Surround speakers are bonded to the soundbar via a low latency, one-way, private connection because they need to be in sync with the video source. Surrounds can only be set up as a pair, the bond is semi-permanent, and they carry surround channels only.
Grouping is the connecting together of more than one room to play the same source in sync (or slightly delayed if TV is the source). This requires a buffer in order to pass through walls and floors, thus a grouped room will have a slight 75 ms delay for TV sources that must be in sync with video. Grouping is not permanent, you can do it on the fly, and grouped room/speaker will play all channels of a music/TV signal, not just surrounds.