Quote Originally Posted by KCMmmmm
Somebody else said this same thing. If there's a shadow element, there must also be a light element. They can't keep tacking on extra elements every couple of chapters. They have to commit to a set of rules. Otherwise, it would be lame. One hidden element? Ok. Another hidden element? What the hell?
Not necessarily, we have already seem shadow type jutsu, well from the Nara family. Although, you could probably class Sai's jutsu as shadow as well, and Jiraiya also just displayed a shadow type jutsu.

Yet, we haven't seen any type of light jutsu (from what I remember anyway), so I don't think that they need to have a light element, just because it's like the opposite. Well, the closest light jutsu's they have is fire.