Conor has no heart. Unless he's dominating, he'll fold if his opponent keeps coming at him.
A lot of that is to do with energy, he can operate much better when he controls the pace of the fight, once he loses control of that he can't keep his gas tank from draining.
He is a shit nail though no doubt, same as Alastair, look great when they are doling it out, wilt when they aren't.