Although Mu Yue already had a Basic Breathing Technique that offered only a modest boost in strength, he would not teach Basic Breathing to anyone who was not his disciple unless they had earned his trust.
Though Basic Breathing did not provide much improvement, it could be considered one of the cores of Breathing Techniques and had tremendous potential for development. Mu Yue's development of other Breathing Techniques also began with Basic Breathing.
To put it in numerical terms, even when Basic Breathing was cultivated to Constant Concentration, it could only raise the combat power of Root and Anbu members by sixty points.
But if a genius under Hiruzen Sarutobi or Shimura Danzō unearthed the potential of Basic Breathing and developed a Breathing Technique similar to Mu Yue's Stone Breathing or Thunder Breathing, its upper limit would be greatly raised. In the end, a Breathing Technique capable of increasing combat power by five hundred points might emerge.
Mu Yue would not underestimate the ninjas of the ninja world just because he was a transmigrator with a system. Someone as powerful as Senju Tobirama had developed a whole host of formidable Ninjutsu and Forbidden Jutsu. If given a Basic Breathing Technique, Mu Yue felt that Senju Tobirama really could come up with a new Forbidden Jutsu.
If Mu Yue taught Basic Breathing to Root and Anbu, and a genius truly developed an advanced Breathing Technique from it, it might ultimately amount to aiding the enemy. That was not an outcome he wanted to see.
At present, Mu Yue had no open conflict with Konoha's higher-ups such as Hiruzen Sarutobi and Shimura Danzō. Root and Anbu were not his enemies, but as for what might happen in the future, Mu Yue could not say.
The Breathing Technique Mu Yue intended to develop