Oliveira has arguably submitted the higher level grapplers in MMA, though. Oliveira submitted 3 high level BJJ black belts and 2 div I NCAA wrestlers in the ufc. Ferg hasn't submitted any div I wrestlers and only one BJJ black belt in the UFC.
Lentz Is a division I wrestler who has only been submitted twice out of 43 fights and he was a legit top 10 FW
Elkins made his entire career out of out toughing fighters and out grappling them. He's been submitted once in 32 fights, and that was by Oliveira.
Jim Miller: div I wrestler and high level BJJ black belt.... submitted by Oliveira.
Hioki was widely considered a top BJJ guy at FW. He's been submitted once out of 43 fights.....that one time by Oliveira.
Jury Is another BJJ black belt. Only one sub loss on his record....again by Oliveira.
The best grappler tony has subbed in MMA would be lee or Tibau I guess?
Clearly tony has subbed better fighters, but he hasn't submitted better grapplers, and styles matter in this discussion.