The top 10 neighbors for John Piper are overwhelmingly fellow Spiritual Leaders — seven of the ten share that subcategory, with scores compressed tightly between 0.97 and 0.98. That narrow band is the defining structural feature here: the shape is flat, meaning no single neighbor pulls dramatically ahead of the others.
Desiring God leads at 0.98, followed closely by Louie Giglio at 0.98, David Platt at 0.98, Matt Chandler at 0.97, Pastor Mark Driscoll at 0.97, Craig Groeschel at 0.97, and Beth Moore at 0.97. The three exceptions to the Spiritual Leaders cluster are C. S. Lewis at 0.97 (a Fact Quote and Lyric Account), Ed Stetzer at 0.95 (an Author), and The Gospel Coalition at 0.95 (a Blog) — all adjacent to the same faith-oriented space but categorically distinct. No athletes, musicians, or media brands appear in the top 10; the neighbor set is tightly bounded by Christian ministry and publishing.
The flat shape across a near-uniform subcategory cluster signals an audience that is highly specific in its composition and does not diffuse into adjacent interest areas within the top 10.