Having an inspired, unique story to tell and telling that story in an inspired, unique way are exclusive of each other.
George Lucas seems to me like someone who had an inspired, unique story to tell but was incapable of presenting it in an attractive, professional manner. Whereas someone like Kershner didn't really have any innovative groundbreaking vision, but when paired with someone who did, he had the ability to take that story to another level through superb command of his craft.