  A question is raised on whether some implied regularity or structure, as
found in soccer team ranking by the Union of European Football Associations
(UEFA), is due to implicit game result value or score competition conditions.
The analysis is based on considerations about complex systems, i.e. searching
whether power or other simple law fits are appropriate to describe some
internal dynamics. It is observed that the ranking is specifically organized: a
major class made of a few teams emerges after each game season. Other classes
which apparently have regular sizes subsequently occur. Thus, the notion of
Sheppard primacy index is envisaged to describe the findings. Additional
primacy indices are discussed for enhancing the features. These measures can be
used to sort out peer classes in more general terms. A very simplified toy
model containing ingredients of the UEFA ranking rules suggests that such peer
classes are an extrinsic property of the ranking, as obtained in many nonlinear
systems under boundary condition constraints.
