Board Thread:Theories and Speculation/@comment-36342497-20180726162715/@comment-33682965-20180807161223

I feel like if Mud Release was established as a concept while Mei was being created or prior, she would have it. There's too much against the idea of her having Mud Release such as statements and the fact that she didn't use it in the first place. While you could argue that she didn't use Mud Release to put out the flames because she didn't have enough chakra, that doesn't excuse the fact that it would've been a great idea to use it at the beginning of the fight to restrict Madara. But since Mud Release wasn't created then, it wouldn't have been possible. It's sort of like the "Why didn't Goku go Super Saiyan God in GT?" debate. While he hypothetically could've done so, (if GT was after Super, which it's not since they're in different timelines) SSJG wasn't created at that time.

And on the topic of Kekkei Genkai, I definitely don't think that they attain natures because of the KG they're born with. If that was the case, then certain shinobi wouldn't need to learn how to utilize chakra natures, because their KG would already grant them the ability to use it, no?

Anyways, I think that it's more potential based. Because of genetics, a certain shinobi would either have the potential to learn how to use the Kekkei Genkai, or they would not.

For instance, the Yuki clan is all tight-knit so the majority of them would likely have the same mutant gene that they passed down, which is no different than with dōjutsu or Shikotsumyaku.

This would mean that Kekkei Genkai is normally hereditary, but can randomly show up in unrelated bloodlines. (i.e. Kazekage Clan and Toroi with Magnet Release) Sort of like eye color, but obviously a Kekkei Genkai would be rarer than blue eyes.

Hence the name, Bloodline Limit. It's not Bloodline Power or Bloodline Ability. It's the limit of what they can achieve and what others cannot achieve, dictated by their bloodline and genetics. So just because Mei has mastery over Water Release and Earth Release, she might not have been born with the innate potential to use Mud Release or Wood Release.

If it were really as simple as "If you have this KG, you automatically get these natures." then how do people attain normal natures in the first place? Do you just assume that they have another nature and a KG, but don't use it?

And if it were really as simple as "If you have an affinity for or mastery over these two natures." then why doesn't Hiruzen have Lava Release or Kakashi Explosion Release?

To reiterate and clarify, I believe that a select amount of people (because of mutated genetics which can be passed down) are born with the ability to learn a specific Kekkei Genkai. If you're not born with that innate ability or potential to achieve it, you will never be able to achieve it.

This is vastly different from natures, which you can learn regardless of what you were born with. While someone may be born with an affinity for Fire Release, there's nothing stopping them from achieving another nature or even the rest of them for that matter. (i.e. Hiruzen.) Whereas with Kekkei Genkai, it will always be something that someone will be unable to achieve.