Do me a favor. Look at the size of that little ship. A meager 3.1 kilometers... The Executor is 19 kilometers long. That's six times the size, six times the amount of weapon mounts. Probably much more than six times the amount of support craft carried within the Executor's hull. It's out of the question for any starship, even a fleet of starships from the KotOR era to be able to face Vader's little toy plane. The Executor is a mobile space station, designed to be the state of the art in military warships of his time, which has over 4000 years of technological development of advantage over the "Courageous".