Because he made a pact with Itachi -_- not to hurt Konoha
and plot U_U
The promise he made with itachi
And the nine- tails has to be sealed last
Does anybody even read the manga anymore?
Lol, thisI doubt that when kish came up with the story, he expected a bunch of sad people to start a forums and talk about every single plot hole or question every scenario of the story.
Because he made a pact with Itachi -_- not to hurt Konoha
and plot U_U