When I watched Elon testify with ULA x-Ceo Michael Gass, he of course panned the Atlas rocket b/c of expense and Russian made engine, but I thought he didn't criticize the Delta family of rockets. He also suggested that the govt use a two rocket system using ULA's Delta and SpaceX's Falcon for a long term solution. Why did he give kudos to ULA's Delta class by suggesting this, isn't Spacex one day going to make a Falcon Heavy or other rockets that will go up against the Delta rockets?