In most cases, no. Stories usually have multiple elements. Ken's rage could be a major part, but there are often other aspects such as the overall theme, other characters' arcs, and the setting. For example, if the story is about a community, Ken's rage might be related to his personal situation, but the full story would also involve how the community functions, its relationships, and its future prospects, which may not be directly related to Ken's rage.
Yes. If the story is a character study specifically focused on Ken and his rage is the driving force behind all the events and character development in the story, then it can cover the full story.
Maybe. If Ken's rage is the catalyst for every other event in the story and all the other characters' actions are in response to his rage, it could cover the full story. But if there are elements in the story that are independent of Ken's rage, then it doesn't. For instance, if there are side - stories about the setting or other minor characters that don't relate to Ken's rage, then his rage doesn't cover the full story.