Although he didn't receive a clear answer from Okafor, by the time Zhang Yang left Okafor's house, he had already put the matter aside.
There's a saying that good advice is often wasted on those doomed to ignore it.
He had done what he felt was his duty with a clear conscience; how Okafor decided to proceed was beyond his control.
The obsession of a person can be quite frightening, and it all depends on how strong Okafor's dissatisfaction is about not being able to become the top pick like Duncan.
Now, Zhang Yang could be certain that Okafor would likely miss most of the season's games.