I really personally hate the way that Gracie fights. I can always appreciate some good Jiu-jitsu but Renzo is not active on the ground.
It always looks like he doesn't even go for a finish. Appearing more so as if he's looking to equilize his opponents activity and is comfortable to lay on top and squeek out a victory in a side mount.
With that said, his take downs are always fluent, and I see him dry humping a victory out of Cung. And holding the belt until he encounters a real BJJ fighter. Or even a fast striker that'll KO him when he shoots.
Cung Le has good wrestling and I doubt Renzo could get him down. I have never been impressed with Renzo as a fighter.