yeah wrestling is grappling. Still clearly a far better grappler than Olivera. Then you could say Maia, Valentina, Dos Anjos, Kron, Dern, Jones could probably dig up more.
Also did you know that Olivera has tapped more than Connor who I see you referred to as the human tap machine. One being to Kahbib oh and someone else who is a better grappler Nate. Could put that down to being there for 10 years but two were consecutive fights.
For clarity Dustin never really had Kahbib in danger. He never had him in full guard. All Kahbib had to do was rotate to his left and then the Guilotine attempt was never a threat which is exactly what Kahbib did. Had Dustin been able to pull guard then maybe it would have been an issue. He did not however.
The tap machine comment is directly from Khabib. See at the very end.
As for the bit about Dustin nearly submitting Khabib....I'll let this speak for itself.