This book provides a systematic comparison of the conditions under which sub-state autonomy demands and statutes came up and evolved in three typical countries undergoing centrifugal sociological decentralisation: Belgium, Spain and the United Kingdom. This concluding chapter summarises the main lessons that this book was able to provide on these questions, and articulates them around a broader dual constellational theory of centrifugal sociological decentralisation. The constellational nature of this theory allows to explain sub-state mobilisation and restructuring as driven by the interplay of factors from different theoretical strands. Doing so, a duality appears between the sub-state autonomy dynamics of two main types of entities: sub-state communities with a strong sociological distinctiveness and historical political grievances (e.g. Flanders, Catalonia or Scotland), and sub-state communities with weaker sociological distinctiveness and historical political grievances (e.g. Wallonia, Asturias or Cornwall). The chapter closes with thoughts on different ways that lie ahead to extend the research, further improve the way it was carried out and prepare for its implications.