Moody said that England need more of a ball-player in the number nine position and for him Ben Youngs would be a better selection.
"No, I don't [think it's the right choice]," he told BBC Sport. "I think Ben Youngs has the ability to cause chaos in defences and individual defenders. He runs hard at the line, he is quick, he is elusive.
"Dickson is a very good grafter, he is an intelligent rugby player, he brings a great attitude that Stuart Lancaster obviously likes, but for me Ben is slightly more dangerous as a ball player."
Joel Tomkins has been selected to make his debut for Saturday's game.