So Kris Overstreet and Martin Rose haven’t written anything in years, so while I’m not going to say that their contributions don’t need to be read, I wouldn’t worry too much. Days of Miracle and Wonder will make less sense if you don’t read Marty’s stuff. Parts of Twilight will make even less sense, but that might just be a sacrifice to be made.

If you have minimal time but can listen to stuff, say at work, several stories have audiobook type recordings that Gryph has done, listen to those in chronological order.
If you want to get someone else hooked/ stay hooked, play them the Symphony of the Sword audiobooks.

Happy Reading