[brazen1]

Yes, the guide is more or less my journey and isn't organized because things constantly change and I change with them and I seldom update previous posts. 

I'm not sure what you want me to expedite for you but with the details you've provided Kodi Matrix v19 is more than capable of handling 4k HDR .mkv's.  I prefer it for passthrough.  It's going to look identical using an external player when also passing through so there's really no point using an external player unless you provide details why. 

Using external player(s) requires moderate modifications explained on post #1 and the links associated with particular setups.  Kodi Matrix requires no special handling.  Just install it, configure it, and enjoy it.  Assuming you are a new user, if you have any specific questions, myself or others can help you either in this guide forum or one of the other specific support forums.  There are many beginners guides to help folks just like you get started.  I suggest having a read here https://kodi.wiki/view/Main_Page and welcome to the Kodi community