He never used 10% of his power, He used all his power which cause him to use RDS which is suicidal... Come with facts next time dumbass,Loss is a loss.. Hiruzen was only using 10% of his power. So they should have beat him. Hashirama and Tobirama had unlimited chakra and Orochimaru was immortal. No way they should have lost to old 10% Hiruzen.