What is the fable about just making up numbers?

Make up a few mistakes: historical allusions in the Spring and Autumn Period and the Warring States Period. Literally, people who can't blow are mixed in the team that blows. Metaphor is that people without real talent and learning are mixed among insiders and shoddy. From Everything is Wrong, Hidden Theory. There will be 300 people playing flute in Qi Xuanwang. Nan Guo invited him to play the piano. He was very happy to hear that hundreds of people supported him in the Zhou Dynasty. After Qi Xuanwang's death, King Qi Huan acceded to the throne. He liked listening to a play very much. When Nan Guo heard about it, he ran away. Qi Xuanwang asked people to play the flute, and 300 people had to play it together. Chu Shi in the south asked to attack Qi Xuanwang, and Qi Xuanwang was very happy about it, and supported him with food from hundreds of people. After Qi Xuanwang's death, the king succeeded to the throne. He likes to listen to one performance after another, and Chu Shi in the south ran away after listening to it.