Foundation X was more like a ladder organization version of the Great Leader.
It is like the man behind the man or a big villanous organization behind another big villanous organization. Now I was wondering now that in Kamen Rider W's movie, OOO is canonically present within the series as the movie was set somewhere within the last 10 eps, specifically in between 44, and 45. This Foundation X pops out of nowhere with that lady with a tab with core medals that could link OOO with that of his predecessor, W. In the OOO series, I was hoping to see them in the long run but they did not. Now as for the crossover film OOO and W, I was expecing them to pop out of nowhere within the show and the plot within the OOO segment is coherent with the series, however it gave me a headache. Then somewhere in the end of OOO, came the Amanogawa High School student duos Kengo and Jojima of Fourze and it seems like they are set in the same world altogether.