you cant jus say shisui is weaker then the 2nd bcuz hes weaker than itachi... think bout it for a second... there arent really too many ninja ... if any that can fight itachi one on one and win to tell the tale.. so theres plenty ninja weaker then itachi, it doesnt make them weak though.. itachi cud go head to head with jaraiya and they wud both die.. and i kno the jaraiya is stronger than the 2nd.. bcuz i kno if orochimaru used edo tensei on jairaya vs the 3rd then the 3rd wouldnt have been able to use the soul reaper jutsu bcuz jairaya zombie mode wud have owned the 3rd..