How to evaluate Sun Yuqiang's role in The Flying Life of Andrew?

Sun Yuqiang is not a real nobody. He used to be a member of the champion team. He is the navigator of Zhang Chi and the eye of Zhang Chi circuit. He also rode a champion car on the top of Bayinbrook. After each victory, he and Zhang Chi boarded the podium together, sprayed champagne together and hugged and celebrated. However, the honor of the champion can only belong to one person. People will only see Zhang Chi who controls the steering wheel. Few people pay attention to him sitting in the co-pilot, so he feels that he has left a mark on other people's stories, but he has no own story. At first, I liked him because Andrew played him. Later, I liked him because he was Sun Yuqiang.