Board Thread:Naruto Discussions/@comment-26145872-20160224185338/@comment-26403664-20160228050500

You could say Black Zetsu since he literally caused most of Shinobi history. But I really want to say Kabuto because he surpassed Orochimaru and was able to complete some of his theories and experiments. The Edo Tensei being one. Also that if Kabuto was aware of the full Sage of Six Paths story I think he would have been able to rival being as much of a master mind as black zetsu. Hell the guy even made counters to fighting Itachi one of the most well balanced characters who was a master in genjutsu and extremely proficient in ninjutsu and taijustu. Easily considered a tier 2 kage level ninja.