The Theme of "Charles"

After reading this story with such an unexpected ending, I think that the theme of "Charles" is mainly about creativity. Why do I think that the theme is about creativity? Well, because... throughout the story, Laurie had been very creative when he made up a character (also known as Charlie), and also had been creative when he lied about how Charlie had to stay after school and that everyone else stayed with him. In the story, if Laurie had no creativity at all, his mother would have already found out that he was lying a while ago, the creative lies helped him from letting his mom discover the truth about Charlie/Laurie... A few other examples of Laurie being creative was when he lied to his mom saying how bad Charlie was every single day, and he made it so sarcastic and dramatic that her mom believed him the whole time Laurie was simple just lying...