Conor McGregor...Who can stop him?

Conor McGregor makes lightning fast career in the UFC. People like him and I like
him too, I like fighters who decides when he finishes the fight and Conor is one of them.
On the other hand, there are some questions such as can he beat stronger fighters? I think there's no chances to stop him for mid-level stars of division like Dennis Bermudez or Frankie Edgar...But what for Chad Mendes or Jose Aldo? They are beasts, top professional beasts and these fights will be the interesting fights.
Also Dana White declared that Notorious would be the next contender for the title. I remind that the Aldo and Mendes bout will held on the 25th of October. So we will see the real test for Conor McGregor relatively soon.