His strength and speed are nearly unmatched in the entire series. In fact, Kakashi admits that Guy is stronger in some ways. ... He builds his tactics around defeating Kakashi, and his taijutsu is better. Kakashi is not a taijutsu scrub, but Guy is one of the best.

Who would win Kakashi vs Guy?

Kakashi's own double Mangekyo Sharingan power is far superior to Guy's eight gates. Even though Guy almost touches the speed of light, Kakashi's Kamui is instantaneous. He's fast enough to blitz even Kaguya Otsutsuki, and as such, Might Guy stands no chance.

Can 8 gates guy beat Kakashi?

Although Guy was pretty powerful in his Eighth Gate, Kakashi's intangibility due to Kamui meant that there was absolutely nothing he could do to defeat him.