I've never been part of CJ's Team, something about not wanting a no good for nothing Canadian working for him or something like that .
What I can tell you is that we met early on when he was posting For The Love in the old eFic section for non Hosted and we interacted on his topic and through PM's. CJ would occasionally ask me to look at something or possibly how feasible something might be within a chapter. I would help out where I could. Truth be told, I really didn't think I could measure up to be a beta for him. At the time I was in awe of Graeme, Bondwriter, Captain Rick and Emoe. First of all to be able to tolerate CJ, but more importantly help him turn out such amazing stories .
Occasionally authors will post for an editor or beta reader and then it is matter of finding a comfortable fit I do believe. GA does offer a Editor and Beta Reader match up where we try to not only help Authors, but develop and improve Editors. Jan and Cia, as head of the WST heads up that team and they have a dedicated forum here.
Myself, over the years I have been asked to beta and then on occasion edit a chapter or then a story. Call me crazy but I have been helping out Krista for a couple of years. Another problem too is that like Authors on the internet come and go, unfortunately betas and editors come and go as well. I think this is really how I started helping Krista and not really for my skills . Besides, the good fights we have over a chapter keeps us both entertained .
Still, I'm still amazed at the work that first CJ puts forth but always know that there is a team of dedicated people behind him that make his writing so damn good! This is also why I will tease and bug CJ, but I will never be hard on him or his team. I'm grateful for every word that makes it to my computer screen.