Wait, you seriously think BJJ level of skill is indicated by number of subs a person has in his career? Enjoy never being taken seriously ever again. And why shouldn't I mention Arona - one of the greatest ADCC champs? Because it doesn't fit your retarded narrative? Get the fuck out of here, you have no clue what you're talking about.
Don't like the weight disparity between Askren and Aoki? Askren completely dominated BJJ blackbelt Lima on the ground as well. You have to be completely ignorant about Askren to even imply that he's just a wrestler and not a complete grappler, same goes for Khabib.
With all due respect to Maia, he is a one discipline specialist, he's not a well rounded grappler. His level of wrestling is nowhere near enough to be competitive with the top fighters in the division who happen to be strong wrestlers. Maia's level of wrestling skill is too low for the level of competition he's fighting - the absolute top.