Narratives are designed to increase the quantity and quality of effective communication in your organization—by an order of magnitude over traditional methods. Creating such solid narratives requires hard work and some risk-taking. Good ones take many days to write. The team writing the narrative toils over the topic, writes its first draft, circulates and reviews and iterates and repeats, then finally takes the vulnerable step of saying to their management and their peers, “Here’s our best effort. Tell us where we fell short.” At first this openness can prove intimidating.
Note that "the team" writes the narrative and obtains external feedback from peers / execs that helps the idea move forward. Shared ownership.