I don't really feel it's the Commissioner's role to express an opinion on the conduct of a committee member, although it's important to work in a respectful manner.
Both witnesses were researchers who were presenting their evidence, their tables. It's up to committee members to interpret them. One table alone doesn't represent an entire reality; it's just one piece of the puzzle. So I think it's important, when you receive that information, to absorb it and incorporate it in your thinking so you can form a clearer understanding of the situation.
As I said earlier, one table doesn't paint the entire picture. Many factors and variables have an impact on the use, usage and status of a language.