Whilst the lack of a byakugan is an obvious stumbling block, what's stopping a ninja outside of the hyuuga clan from learning jyuuken? The conditions required to do so match the qualities required of a top-class medical ninja. Let me explain:
These scan below describe the two main conditions for using jyuuken: precise chakra control and surgical precision. This is something that's not out of a medical ninja's reach.
Who has both of these qualities? Sakura is one good example.
To be able to locate a small portion of poison inside somebody else's body requires the eye-of-a-needle precision required to use jyuuken
As does the ability to make an on-the-spot incision near the heart without damaging the patient
When you consider the fact that as a medical ninja, not only does sakura have the surgical precision and chakra control required to master jyuuken but she also has a vast knowledge of the human body. And let's not forget that the chakra points are wrapped around vital organs.
When you put all of this into consideration, it may be possible (at least on paper) for a non-Hyuuga to learn jyuuken. The eyes merely make the process easier but this can be balanced out with perfect chakra control, surgical precision and an encyclopedia of anatomical knowledge, something which Sakura possesses.
These scan below describe the two main conditions for using jyuuken: precise chakra control and surgical precision. This is something that's not out of a medical ninja's reach.
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Who has both of these qualities? Sakura is one good example.
You must be registered for see images
To be able to locate a small portion of poison inside somebody else's body requires the eye-of-a-needle precision required to use jyuuken
You must be registered for see images
As does the ability to make an on-the-spot incision near the heart without damaging the patient
You must be registered for see images
When you consider the fact that as a medical ninja, not only does sakura have the surgical precision and chakra control required to master jyuuken but she also has a vast knowledge of the human body. And let's not forget that the chakra points are wrapped around vital organs.
You must be registered for see images
When you put all of this into consideration, it may be possible (at least on paper) for a non-Hyuuga to learn jyuuken. The eyes merely make the process easier but this can be balanced out with perfect chakra control, surgical precision and an encyclopedia of anatomical knowledge, something which Sakura possesses.