John Sellars doesn't miss.
Given the nature of Marcus Aurelius' Meditations (or 'To Himself' as a more literal and original translation of the book's title), it is a book in which Marcus, already a committed Stoic, sets out to digest and internalize the theoretical principles of Stoicism, and gradually integrate them into his character. As such, the book presupposes knowledge of classic Stoic doctrine and doesn't expound it explicity in most cases.That is where Sellars' book is really helpful in making sense of the Stoic theory at work in the Meditations and to give the reader a deeper, fuller understanding of what Marcus is talking about. The Robin Waterfield's annotated translation of Meditations has also been helpful in understanding the text since he includes many insightful footnotes that offer context and additional scholarship that make the implicit ideas that are baked into the Meditations explicit.