heliotropic - hey, great tournament result!
seems like a great idea for the development of young grappling students: train them primarily with effective ground work (and good ne waza and ne waza defence, too) and have them compete in judo often rather than exclusively bjj tournaments. the result being they grow up with no fear of takedowns or transitioning to the ground, so when they're more mature they'll be much more well-rounded and experienced when they compete in big bjj tournaments.. (in my opinion don't keep competing exclusively in judo as a senior, it's too specialized now that they took out leg attacks)
In their case, they started in Judo first and as I said, Judo helps them in BJJ / grappling and as you can see Bjj helps their Judo.