He knocked down diaz one of the greatest chin, and he was at 170. He destroyed alvarez. He hit khabib hard but lets not forget Conors power is a counter straight left. All his knock downs are counter straight left. Which means hes using the momentum of his opponent as a power advantage for his own punch. Usually people miss a right punch and are left wide open for conor to pin point their chins. Khabib always keeps his right hand up and didnt step too far into his right handed punch, therefore denying conor the opportunity to counter. Khabib is very good at leaving his hands up thats why 4 knock out artists in johnson, iaquinta, barboza and conor couldnt get many good hits on him. You are just underestimating khabibs defense coupled with takedown threat