Explanation:

- Herbert Spencer: Focused on organic analogy and the evolution of society. He did not specifically discuss the "role system" as the matrix of social structure.

- Radcliffe-Brown: Emphasized social structure as a set of relations between entities, but focused on functions rather than detailed role systems.

- MacIver and Page: Talked about social structure and institutions, but their focus was broader, discussing social relationships and processes in general.

- S. F. Nadel : Highlighted that the "role system of any society, with its given coherence, is the matrix of its social structure." He focused on roles as building blocks of social organization.