Dede has always been sort of an iconoclast in the sport. When he and Wendell Alexander teamed up, it was sort of a big deal in the BJJ community because finally there was someone to break the hegemony of Gracie Barra, Humaita and the other teams. Also, by teaming, they created an association that firmly united the two lineages of Mitsuyo Maeda's BJJ. Alexander came from Luiz Franca's lineage. Franca was one of the other students of Maeda along with Carlos Gracie. Alexander had trained with one of Oswaldo Fadda's black belts so he was well versed in footlocks which were of course controversial among Gracie BJJers at the time. By coming together to form the "new union" (Nova Uniao), Dede got to introduce his students to whole technical refinements in BJJ.
Dede also was the first rebel against the IBJJF, founding the CBJJO World Cup back in the early 2000s because he thought BJJers should get paid instead of paying to compete. It was the creation of this event that caused the big rift in Alliance resulting in the split into Brasa, Checkmat, TT, NineNine and eventually Atos. I believe Demian Maia was the first Alliance black belt to go compete in the World Cup and Fabio Gurgel basically kicked him out of Alliance for it. Dede wanted to give these promising athletes a platform and he did it for as long as he could.
He rebelled in other ways by training non-Brazilians in BJJ and holding nothing back at a time when others wouldn't. John Lewis and BJ Penn are a direct result of his openness. He was reviled by Carlson after Lewis fought Carlson Jr. to a draw, but he stuck with it. Back then, he and Joe Moreira were two of the only guys training non-Brazilians for NHB.
Later, he started a program going into the favelas and offering poor kids the opportunity to train for free instead of the sport just being for middle class Brazilians. That's how we ended up with guys like Jose Aldo and Renan Barao. He built his MMA team from the time they were kids and he's never shied away from making sure they can get the most out of their contracts, being a vocal advocate of enhanced fighter pay.
As a fighter, he also did well, drawing with Uno and Sudo, beating up Sato and losing on a cut to Miletich. Really, the guy has done it all.
For all the credit guys like Greg Jackson get, Dede, Wendell and the rest deserve just as much. His students back home are incredibly fortunate to have him back in the academy.