I'd like to thank Kishi for proving that Black Zetsu is one of the strongest Akatsuki members to exist,
everyone out of the category Rikubito or Madara falls under his killing spree.
For starters let's give some credit to Obito who did withstand these endless torture and pain throughout the arc.
Basically this is where an ordinary(with the exception of Obito) shinobi supposedly dies.
But he even defy the yin'yoton jutsu (although he never master it himself)
For God Sake... even that, one blow after another one...
So finally we are here, he did the impossible, he attain control over the Juubi.
We all know that
Nagato betrayed Obito
Obito betrayed Madara
Black Zetsu betrayed Obito
Always sneaking in the shadows hiding his abilities to it's full extend
We used to know about his Mokuton abilities
He can become one with the nature
He's the only one who can travel almost as fast as Obito when space-travelling through dimensions.
But the greatest feat of him, in addition that he is mere a portion of Madara's yin'yoton power he managed to solo Obito like it was a child's play for him. Madara said it himself that Juubi is no longer inside him.
At this rate Black Zetsu stomps almost everyone in NV.