Nine of Arby's ten nearest neighbors by audience shape are motorsports and sports entities — six NASCAR drivers, two racing or sports teams, and the NASCAR league itself — with Natural Light (0.92) as the lone non-sports entry. Similarity here measures how closely two entities' audiences resemble each other in composition; scores across the top 10 run from 0.91 to 0.92, a narrow band consistent with the flat shape classification.
The NASCAR concentration is the defining structural fact. Jeff Gordon (0.92), Brad Keselowski (0.92), Tony Stewart (0.92), Matt Kenseth (0.92), Dale Earnhardt Jr. (0.91), and Ryan Blaney (0.91) account for six of the ten slots. Stewart-Haas Racing (0.91) and NASCAR (0.92) extend that cluster further. The one outlier from the racing world is St. Louis Cardinals (0.92), a baseball franchise whose audience shape nonetheless lands squarely inside this group. No other QSR appears anywhere in the top 10 — Arby's nearest audience neighbors are almost entirely drawn from stock-car racing fandom, not from the fast-food competitive set.
The flat shape means no single neighbor dominates; the audience overlap is consistent and dense across a specific sporting tribe rather than anchored to any one entity.