Is being great in Jiu Jitsu enough in MMA?

sure, this question is somewhat related to jon jones's dismantling of shogun rua, but did it actually start way back in the matt hughes royce gracie fight? perhaps that fight laid the groundwork. there was a time when great jiu jitsu skills were enough to win a lot of fights, now it seems like if you don't have other skills to go along with jiu jitsu, you can find yourself getting smashed, especially by greg jackson fighters.