I don't think Athrun'll own anybody with a Gouf in the next episode. No matter how great Athrun's skills are he can't manage with a Gouf against the currently most powerful mobile suits available which are both piloted by very skilled pilots. After Shinn stops hesitating, like we can predict by his exrpession in the last scenes of ep 36, he'll take down Athrun without any problems considering if he knows how to use the Destiny.