watching d anime, u can see that Kabuto showed Tobi d wrong hand signs to stop Edo tensei. He told him that it is: "Dog, Horse and Tiger".... Whereas he told Itachi something else and Itachi made him do Rat, Ox, Monkey, Tiger, Dragon and Boar"
This makes me feel like Kabuto was lying about everything he said, especially where he said killing him wont stop Edo tensei and about performing Edo tensei; that you will need a portion of flesh from the dead person... He said d jutsu was meant to wipe d map including d caster, so how can the Edos be alive when d caster is dead, i.e d map will be populated of dead ppl (edos)...
Also, there is a plot no jutsu because I wonder how Kabuto managed to summon Itachi because I recall d battle between Sasuke and Itachi, at d end, Tobi took Itachi's eyes for Sasuke's sake, and then Zetsu devoured Itachi's corpse. So can Kishi tell us how he got d flesh of Itachi that he used or Kabuto is lying to Tobi. Also, Tobi shld have known that Kabuto was lying because when Pain had d rennigan, he cld tell when someone lied to him and their tongue gets pulled out, that shows that Tobi cant really used Rennigan like Pain... simple
I think Jugo and d other Taka guys will bring d secret of performing Edo tensei or how Sasuke can power up his EMS because Orochimaru did a lot of research on both Sharingan and Madara, that's why he wanted Sharingan for himself.