[Chris is me]

I'll do that, but I doubt it will prove anything, as the beta test teams are made up of well-established FRC teams and thus likely have experience building robots and are more likely to "have their act together" than Random FRC Team X. All it would prove is that FIRST picked beta test teams that happen to do better than average at regionals than a "typical team". Teams like 67, 1114, 254 do a lot of winning in FRC.

If the beta test teams were drawn randomly out of a hat and there were more of them you could probably get a definitiveish answer, but there really isn't a numerical way to quantify "advantage".

What reason do you have to believe we had an advantage?

An interesting statistic that probably also doesn't mean anything would be the number of teams that had never won regionals before the new control system that were beta test teams this year compared to the number of "new" regional winners, or the number of years since the last regional win for a team, though that doesn't guarantee the control system was what mattered or if the team is better at ball manipulation rather than other objects or that the game design did not influence the team to win or the team did not improve.