Do you believe Zhang Yang can definitely lead the team to a comeback?
No, Big Bird's trust is not about that.
Throughout his career, as one of the top clutch players in the NBA, he knows that leading a team to fight back in adversity requires ability and luck, perhaps equally balanced, but their combined share might be less than half. More importantly, it's about confidence!
Back in the day, whenever he faced adversity, he always believed he could come back and made his teammates and coaches believe he could lead the team to a comeback. Back then, he taught Zhang Yang the same. Now, he certainly needs to trust Zhang Yang unconditionally, just like how Bill Fitch and KC Jones trusted him back then!
