I watched a bit of the hearing, but not all of it. I got the impression that he is weasel. He apologized because he got caught. He tried to downgrade his involvement with ACA as just being a number cruncher making unfortunate comments outside of his pay grade.
He is not some backroom genius that can't bend over and tie his sneakers. He was actively pushing this crap...
He was put on the spot by Issa for not filing out his income statements as required. When those get completed and become part of the questioning things may get serious.