I just recently read the breaker from the beginning and it occurred to me that Shiho and co. actually stole 3 of the One Moon Divine Pill that was used to cure Shioon. This means that there were still 2 pills left.
While it may seem that Shiho gave Shioon the pill as a gesture of goodwill, he may have in fact been used as a test subject. Shiho ran into him by chance and discovered that he had a 3-Yin Body Type which is a less severe version of Sosul's 9-Yin Body Type. Seeing this as a rare opportunity, she may have decided to give him one in other to confirm that the pill could really cure him of his weak body which in torn would mean that it could cure Sosul as well.
I haven't read it thoroughly enough but I find it suspicious that she just decided to give him such an important pill out of the "goodness of her heart".
For Sosul's power, it might simply be an extreme version of Shioon's situation with the massive ki that nearly destroyed his body, but in her case after consuming the pill, she has been taught to channel the massive ki out into other things/people. And through observations made during Shioon's "test case", they were able to refine the treatment further so she won't have to suffer as much damage from the ki as Shioon initially did.
What are your thoughts?