Why did Cao Cao lament that he was not as talented as Yang Xiu?

Why did Cao Cao lament that his talent was not as good as Yang Xiu?

When Cao Cao was building the garden, the craftsmen asked Cao Cao to review the design drawings of the garden project before starting work. Cao Cao said nothing but wrote a movable type on the garden gate. The craftsmen were puzzled and hurriedly went to ask Yang Xiu. Yang Xiu said: "The Prime Minister thought that the design of the garden gate was too big." The craftsmen modified the plan according to Yang Xiu's prompts. When Cao Cao saw the renovated garden gate, he was very happy and asked the craftsmen how they knew what he wanted. The craftsmen said that it was thanks to Master Yang's guidance. Cao Cao praised Yang Xiu with his mouth, but in his heart he hated Yang Xiu's talent.

Cao Cao and Yang Xiu were riding horses. When they passed by Cao'e's stele, they saw eight characters engraved on the back of the stele: Huang Juan, Young Woman, Grandson, and Jijiu. Cao Cao asked Yang Xiu what he understood about these eight characters. Do you mean? Yang Xiu wanted to answer, but Cao Cao said, "Don't say it yet, let me think about it." After walking thirty miles, Cao Cao said, "I already understand the meaning of those eight words. Please tell me your understanding." "Let's see if we have the same view." Yang Xiu said: "Yellow silk is the color of silk, so it is perfect; a young woman is a young girl, so it is good to be together; a grandson is a daughter's son, and it is good to be harmonious." The meaning is "ci". These eight words are "excellent words", which are a tribute to the inscription on Cao E's stele." Cao Cao exclaimed: