There's also the distinction of pxp and color commentary. Ironside is the color commentator, where he ads his experience and the technical know-how to explain to the viewer/listener. His broadcast partner, Stephen Grace sets it all up. Gibbons calls this "down and distance" - so when Jim and I have worked events, I'll set the table with the basics of what's happening and Gibbons jumps in with what's happening with the wrestling mind. When you're on a one-person show, like Byers is 95% of the time, you're going to lose the technical aspects, but probably get a more data-driven type of commentary. Wrestling's vernacular is also very, very regional. If I call a move one thing from how I learned it in Virginia, it doesn't always translate to the same meaning here in the Midwest. I called a heavyweight's shoulder roll a "jelly roll" on a stream once with me and @Viratas when we were with TOM. He was like "Jelly Roll? Stop thinking about food."
As far as finding people to do this - much like the topic we had with why teams don't do their own content. Quality control, although BTN's history with it's Student U seems to throw that theory out the window at times. There might be people at these schools with the ability, but usually there's one person for the school hired to staff these events - if those people don't know that there is someone who exists on campus or in the community - they don't know what they don't know.
I know we all have our preferences with how we like to hear a match called and yes, it gets VERY annoying to hear people who butcher the calls. People do business with folks they know, like and trust - you don't always have someone who fits those criteria around the people who make decisions.