Another forgotten name IMO is Johil de Oliveira as a P4P great in Luta Livre...yes, he had a 7 or 8 fight losing streak, but was after his accident in PRIDE and after a car accident in which he lost the eye sight on his right eye. At the time when he was on top, it was during the Vale Tudo era, having a ten or eleven fight undefeated streak, these were the times of the Tournaments with a 30 minute round. It was really hard to be either undefeated or having a long streak while fighting on these ruleset. Plus he gave Pele his first defeat, won more than one Vale Tudo tournament and was after the fight against Pele, the number one in the World at his weight class.
Yes, his record is not the best...but take in mind that he was a Lightweight fighting against Heavyweights on Vale Tudo fights.