Zhou Shuren thought it was some other matter, and he indeed held a high opinion of Lord Wang, willing to give face without sticking to the bottom line, but taking on an apprentice was out of the question, not only because it was troublesome, but also because he wanted to use his precious free time to educate Chang Zhi and his grandson.
For now, passing the responsibility for Chang Zhi onto Chang Lian was not feasible; who knew when Chang Lian would be capable of taking it over? In the end, he had to shoulder the burden himself. In order to ensure a good life for both himself and Chang Lian, he needed to seriously deal with this issue concerning Chang Zhi.
As for his grandson, the boy was the foundation of the Zhou family. Although he did not teach him hand-in-hand like Mingyun did, he would still make time for instruction.
Since having a son, many problems extended beyond just the responsibilities of inheritance.