As a Baptist, I was a little surprised to see Baptists grouped with Unitarians and Quakers in this video. But watching the video, it makes sense.
What Ryan Reeves does is to look at the Anabaptists and how that movement affected other groups. Characteristics of Anabaptists found in later groups, even though those groups may differ somewhat from each other. This video gives a nice description of this important time in church history.