I still don't think we have seen a true BJJ + overall grappling phenom yet, like someone who can match a American Olympian or Dagastani takedown game with the skill of excellent passing and submissions.
Oliveira is close, but doesn't have the wrestling pedigree. Maia was an absolute joy to watch, but he only got his wrestling to a level that was serviceable which helped him immensely once he put it together. Maia is probably the best application of meat and potatoes BJJ, never rushed or did anything overly flashy. Just extremely excellent technique, position over submission.