Well, an interesting wrench to throw into the argument would be to ask if muu and the current tsuchikage are blood related. They are the only ninjas known to use, "bloodline expansion", which in their case is manifest as "dust arts/techniques". There. Is less wiggle room here as you have a third element that must be used instead of just 2 and the odds are worse because it's rare for a ninja to have 3 natural elemental abilities. That being so rare and the fact muu and oonichi could compose the exact same 3 elements to perform dust arts yet where is any other indication they are blood related? They are from the same village from the same time period (with age difference) and oonichi learned the expansion techniques from muu but to my memory and knowledge was neither a son or nephew of muu's.
If that case is true then how much easier it is to accept "bloodline limits" as more open to interpretation and actual performance to unrelated shinobi but having the same elemental capabilities.
In the end i think 2 elements combined to make a tech is not necessarily a bloodline limit but bloodline limits outside of special doujutsus will require two elements. How would you classify black lightning?
The bloodline limit, i think, has been incorrectly assumed and the definition must include the moment where a certain clan or lineage has not only a certain elemental affinity but also a unique way of composing it. Crudely, it could be illustrated that all clans can produce bread but only one special clan can produce toast. So when they produce toast with the common composition of butter or jam you get a breakfast kekkei genkai whereas any other clan will produce an undesirable soft mess not fit for any meal.
Not only that, kekkei genkai outside the doikutsus (sharingan etc.) Should perhaps also be defined by Yin and Yang levels present or required by the technique. Not every water or earth element will be molded the same way as hashirama was the only person able to mold earth or water different from everyone else to produce mokuton.
Bloodline limits were just not adequately defined IMO and should be compared to baking. Backing is almost an exact science and two peoplevusing the exact same ingredients will produce wildly different results in texture and taste depending on measurements of each ingredient, extent of mixture and level of tempurature over time.
My understanding anyway since the simple definition the manga provided was not adequate in preventing confusion or seeming contradiction.
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