Would it not make sense for the Beta Testers to come from all three of the aforementioned groups. The Newbies, who could do the unexpected when it comes to testing the waters. The Veterans who know the games subtle nuances and have a history of knowing the previous engines, their changes, their shortcomings and their successes. The In-Betweeners, those of us mired in DII mediocrity or low-level DI trying to move up the ladder. Guys that have a good understanding of the game, better than Newbs but not as well as the Vets.
Each group will play the game how they would normally play and had their suggestions or comments, questions or concerns, when they come up.
Just a thought.
And as far as the Knight thing goes, I agree with the idea that Seble may just be cloning that world for the Beta Test. It may be detrimental to have a team in Knight for that reason (That being if you wish to be a Beta tester).