Buale is a small irrelevant village but it being the capital allows Middle Jubba to keep pace with the wealth and development of Gedo and Lower Jubba. Its also centrally located, allows the people of the state to build it up together as well as give them a feeling of ownership and shared camaraderie. Plus I may be biased with how PL developed with picking Garowe (central location) which was overshadowed by Gaalkacyo and Bosaso.
Good reasoning but Buale is not located in the center. I think personally Baardheere is much better option as capital even if its not centrally located either.