Any commentary is going to have to include some "off topic" discussion, or it will be very dry and uninteresting during the 'slow' parts. You could just have every player submit a screenshot of their "progress" screen, so you could ramble on about random stats as needed. "dragonmere has over 5 days of piloting experience, with a 3:1 KD ratio, but only 12 hours as gunner". Additionally, everyone involved in competitive play could fill out a really short random "bio", like how they do on game shows. During lulls in action, make like the beginning of Jeopardy!, "Now it says here dragonmere owns 12 cats, and has been working on his thesis about the healing benefits of ingesting dandruff, interesting stuff!"