So what what.. The power is always there but he stops looking for that Ko after a few rounds otherwise he would gas out.. And that's bad news vs Khan.. Thurman best bet is to Ko Khan early..
Khan is a fast starter as well. Look at his biggest fights- Alexander, Peterson, Garcia, Malignaggi, Judah, Maidana...was electrifying first couple of rounds in all those fights....so if Thurman goes for an early knock out, he may well find himself in trouble