Board Thread:Naruto Discussions/@comment-945885-20140820060530/@comment-3279282-20140830222911

The original:

…風火土雷木

陰陽　全ての性質を合わせた

血継網羅の膨張求道玉

and my translation:

...Wind, Fire, Earth, Lightning, Wood

Yinyang — an all natures combining (TN: 合わせた is actually the past form, so it's "combined")

Expansion Truthseeker Orb of Kekkei Mōra

The crucial part here is the —. Black Zetsu pauses here, which suggests that the list of natures was simply that: A list. Also, it's really more than obvious that there should be water, simply because it's part of all basic natures, while wood is not.