@chewitt thank you for the information and explanation, it helps me understand better about what is going on. Although, this causes me concern, it makes me feel WiFi will never work on the Khadas VIM2 beyond kernel 4.9 (especially, given Khadas has new versions of the VIM2 board out now)(my board will fade into obscurity 
) 
. I guess this is the state on Khadas’s main Ubuntu build
( https://dl.khadas.com/Firmware/VIM2/Ubuntu/EMMC/VIM2_Ubuntu-xfce-bionic_Linux-4.9_arm64_EMMC_V20190319.7z ) as well. So the Khadas VIM2 Max (v1.2) with AP6359SA WiFi seems to peek at Kernel 4.9 