because shukaku's jinchuriki aka gaara is not dead. this is the reason why he cannot use shukakuI have always wondered why Tobi hasn't used the One-Tailed Shukaku... Gaara obviously is not dead yet, but Tobi could have used another dead/revived body through the Summoning: Impure World Resurrection. he would have an extra advantage, not that I'm siding with him tho... Any thoughts, am I the only one wondering??