If this is true, then there should be a correlation between founders' verbal communication skills and their companies doing badly even when we exclude those with accents. Have you seen this in Y.C. companies?

I do agree that most people (investors, press, potential employees, partners) don't consciously discriminate against foreigners, but their models of the ideal founder are current successful founders, who are mostly north american fluent-in-english men. Could this be related to the correlation you have seen?