The reasons for the design of the tailplane on one aircraft, however significant, is not a major point of history - in any case your opportunities to challenge him about it ended last week; as it was over his assertion that he saw Adolf Hitler shake Jessie Owen's hand, which also goes against what most historians say. This isn't the time or place.
I'd met Scott Crossfield, and followed the work of Neil Armstrong. Hard to say that either covered the breadth of Captain Brown's work, nor did as much to help the world learn from and use their experiences. They'd still be in the top 10 most significant test pilots in history however.
Seriously if you have an investigative point to make - do what I occasionally do: write a paper for Journal of Aeronautical History, and let it go for full peer review. It's an interesting experience, and when published, those papers matter. But criticising a great man a week after he'd died, when there was adequate opportunity to challenge him directly, strikes me as inappropriate.
G