Experienced well known players are the best to commentate, because not only they know the game, but they also know the players to speak and tell stories of what had happened in the past, it really make it more exciting to watch & hear them, and for the game they are usually spot on with their guesses and what should of been done on situations.
ofcourse Billy incardona, Grady mathews, Buddy hall, Nick varner, are examples from the past with accu-stats and how successful their videos were only because of the commentators, believe it or not, a commentator can easily make a horrible match look good and exciting and visa versa where a bad commentator can make a great match look horrible, It's an important subject and yet some pool streams neglect how important it is to put players that are known in the booth. They should be known, famous, and knowledgeable. and why is it important that they are known is for the credibility purposes in the eyes of the viewer.
Look at every other sport, most of the times, like 90%, the guys that are commentator were an old players that retired.
I'm not gonna suggest or name names, you think of it, there are plenty of retired pool players that are known in the world & have plenty of knowledge in the game.
So who you like?

Ray