Sorry, but I did not think that he stood up at all to Congress.
Most of his answers were 'I don't know', 'I was not involved', I did not make that decision' or 'I am not an engineer'.
My impression from watching was that if he was truthful, he had no idea what was going on in his own company.
In the end he was responsible for the company, but was too worried about lawyering up.