Justin needs to be the man in charge, running the behind the scenes stuff. Its his business, he can't be handling the commentating. Plus, IMO, Justin is not a good commentator. He doesn't know the game like the other guys, and he likes to talk like one of us when he's in the booth. I remember when he was in the the booth before they had regular commentators, and it was like he was one of the boys at the pool hall shooting the sh!t, instead of talking about the match. He self admittedly said many times he's not even going to attempt to commentate on the game situation, especially the one pocket games.
I'm not busting on the guy. In fact, I think he is super smart for stepping out of the booth and letting dedicated guys run it. When you are the boss, you have to surround yourself with the best people you can, in all aspects of the company. Even if they are better/smarter/funnier/whatever than you. And you put them where they are most useful. Thats one way to help your business be successful (although it certainly does not guarantee it will be...)
That's one difference between Justin and Mark. I believe Justin realizes his limitations, whereas Mark thinks he's great at everything. I'd bet anything the reason Justin explicitly asked us to post the feedback (even though we ALL gave him an earful on the chat), was so Mark could read it and see for himself.
Now, if Mark reads all this, and continues to insist on being a commentator, well then he better take the advice given here to heart. But better still would be for Mark to recognize he is just not cut out for a commentator, and do other things instead, such as the vision for his companies.