Naruto 316

[Elessar]

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To combine/mix two elements to bring forth a new element puts a lot of stress on your body, therefor, you need some special strength to accomplish this. This special strength can either be inherited through a genetic trait in your clan, known as bloodline limit (Haku), or a rather spontanious genetic mutation (Shodaime/Yamato).

That is the requirement for creating a new element, not for having a bloodline limit. A bloodline limit may enable you to mix elements and bring forth a new one (Ice), but being able to do this is not necessarily a bloodline limit (Mokuton) and having a bloodline limit does not necessarily mean you can mix elements (Byakugan, Sharingan). Therefor, as kakashi said, creating new elements is a bloodline limit-like ability in that it is a special ability that, for example, can't be copied via Sharingan.

[Edit] grammar nits.