The low level of his first Orthopedics medical skill is probably due to his lack of any foundation in Thoracic Surgery.
Separation Skill and Anastomosis, he obtained Level 3 right from the start, because these are Advanced Medical Skills derived from the basic surgical skills like cutting, suturing, and ligation.
For bone setting, he had no surgical foundation at all.
The fact that he could successfully set a bone on his first try was partly because he was highly talented, and also because all things in the world share common principles. His four basic surgical skills had all reached the Chief Level, which enabled him to draw analogies from one case to another.
When setting bones, he was definitely much stronger than a real novice.
"Orthopedic surgery is an inevitable obstacle in surgical skills with many applications. Now that I've acquired this skill, it would be nice to take the opportunity to improve it gradually."
Zhou Can has always liked to plan ahead.