Board Thread:Episode Discussions/@comment-1181222-20160421111843/@comment-734582-20160421194713

Omnibender wrote: They made Orochimaru look like a complete amateur with Edo Tensei. The Kazekage managed to get free of will-erasing kunai and go back to the Pure Land with zero effort. Well he had to be an amateur before he became good at it. Certainly explains why he never spammed it before the Konoha Crush. Even then, Orochimaru continued experimentation to perfect it further (kabuto could control many more and much more precisely than Orochimaru) and then Orochimaru once further perfected it with Hashi's cells to call back ninja in an even stronger way.

It clearly was not a finished jutsu during the Konoha crush, this is before that crush.