Tatame magazine published a interesting diagram which traces the roots ofJudo/Jiu-Jitsu or Gracie Jiu-Jitsu/ BJJ in Brazil. It not a very known fact that there were other sources of Jiu-Jitsu in Brazil that happened at the same time as the Gracies. Maeda (conde Koma) wasn’t the only Japanese teaching jiujitsu/judo in Brazil. Takeo Yano came to Brazil around the same time. He taught in Pernambuco, and some of his students include Jurandir Moura & Ivan Gomes ( Ivan Gomes fought Carlson Gracie Sr). Another lineage is Satake-Vinicius Ruas- Marco Ruas. However we can agree that the Gracie Family can take the credit for popularizing Jiu-Jitsu throughout the world.
if you want to learn more about the fascinating beginnings of Judo/Jiu-Jitsu in Brazil, check out this article