Naruto Chapter 446

[Yukimura]

@Sam abilities that require a bloodline limit to work and techniques that require a blood sacrifice to work aren't necessarily the same thing. As evidence the Fourth, a blood relative of Naruto, already had an entry on the the contract with the toads but Naruto still had to put his blood print on the scroll to make a connection with them. It hasn't been shown that there can't be summons that only a person with a specific bloodline limit could accomplish but from what has been shown it doesn't seem like it's a requirement in forming a contract in general.

Also, not all jutsu break down into an element or combination of elements. During Kakashi's explanation Naruto asked about the elemental natures of Shikamaru's shadow jutsu and medical jutsu and the jutsu that let Chouji change his size. Kishi explicitly avoided explaining these by having Yamato hint that there is also a Yin/Yang aspect to chakra which might explain these things but then shrug off getting into them as they were too complicated for Naruto who was just learning about elemental manipulation.