As a member of the Root, Sai is a highly capable shinobi, who is trained in the organisation’s kenjutsu. Being said to be the strongest Root member of his generation, Danzō had enough faith in Sai’s abilities to task him with singlehandedly kilAs a member of the Root, Sai is a highly capable shinobi, who is trained in the organisation’s kenjutsu. Being said to be the strongest Root member of his generation, Danzō had enough faith in Sai’s abilities to task him with singlehandedly killing Sasuke.