Here's another point. Just because you have insight into a project or genre or something doesn't mean you're a good Down In Fronter.
Eddie is a great example. If DIF ever does the Karate Kid or Drunken Master or some shit I want Eddie there. He has all the awesome kung fu insight be he's also very entertaining. He fits the DIF mold- you listen to Eddie talk for two hours and he's immediately a new friend in your head.
Trey's Abyss commentary wasn't awesome because he worked on the Abyss, it was awesome because he worked on the Abyss and he's a hilarious asshole. I love you Trey, you know what I mean.
There's a certain amount of charisma required to DIF, and the core four have it in spades- as does Eddie, as does Ryan. If you have someone with personal insight who fits in well with the team and brings more to the table than raw factoids about the project I could find with a little research, by all means bring them. If you do The Wrestler without me I'll kill all of you. But just be a little selective about who you let on the air, because I DIF for friends in my head, not to find out the dirty secrets of the Best Boy on Legally Blonde 3.
When.