Just a shot in the dark....(no mud in your eye) I think he gave him the eyes while in the Rinnegan state. So him not being an Uchiha maybe he couldn't alternate between the Sharingan and Rinnegan. Just a guess.He had the eyes of madara that is the sharingan
But Kakashi can switch between regular and MS.Just a shot in the dark....(no mud in your eye) I think he gave him the eyes while in the Rinnegan state. So him not being an Uchiha maybe he couldn't alternate between the Sharingan and Rinnegan. Just a guess.