It’s funny you bring up Mighty Mouse when he tapped a guy in a tourney that had been doing BJJ longer than him, and had nearly 100 pounds on him.
Also, Dustin tapped Brian Fucking Shaw. You don’t get much bigger than him. So yeah, he 100% could. You’re one of these guys that thinks being bigger will always prevail when that’s almost never the case when training comes into play. He’s not some “just got his pro card” local fighter, and you know that.