The Gaia Reproduction Plan served as fertilizer for the development of the Gaian Alliance. If there were some parties who weren't entirely on-board with the federalization process of Gaia for all matters relating to outer space, they now had very little choice. The Panamic Alliance could have very easily kept this plan for themselves and could have capture the gargantian with their own forces, using its power to get their hands on the way to help Gaia reproduce across the cosmos.
However, because the Emperor of Water offered it as a benefit to joining the Gaian Alliance, the incentives were overwhelming. Ru discovered that the development process grew a lot smoother from that point on after she conveyed to all nations Rui's intentions to share with them the fruits of the Gaia Reproduction Plan as long as they fully committed to the structure of the Gaian Alliance.
