In Zhou Wenwang's time, King Wen played Yi in Qiang, and three hexagrams overlapped. Now he uses six hexagrams as hexagrams. King Wu made a rude remark.
In the era of Confucius, Confucius and his disciples made eight diagrams explaining the Book of Changes.
Confucius' later name was Zhouyi, which means going round and round.
Of course Zhouyi is better.