Why didn't Lu, a talented country, become a member of the Seven Heroes of the Warring States Period?

The Seven Heroes of the Warring States refer to the seven vassal states of Qi, Chu, Qin, Yan, Zhao, Wei and Han. At that time, these seven countries gained a lot of land, population and resources through the merger war in the late Spring and Autumn Period, and just entered the ranks of powerful countries. Why didn't Lu, who was full of talents at that time, become a top power? How was Lu finally destroyed? ?

Lu is a vassal state that originated in the Zhou Dynasty. His first monarch was the son of Zhou Wuwang's younger brother, Duke Zhou. In the early Spring and Autumn Period, Lu was a big country. He occupied part of the land of Cao and Song by war and became a big country in Shandong Province. At that time, Lu's territory was very vast. Most importantly, Lu attached importance to education, trained a large number of talents, produced theorists such as Confucius and Lu Ban, and also appeared famous scholars in the Spring and Autumn Period. Why can't Lu be on a par with the Seven Heroes of the Warring States? I think the main reason is that Lu lacks top military generals. ?

No matter when the highest military commander is, he is the most indispensable top talent in all countries. Very often, an excellent military commander has a great influence on the comprehensive national strength of the whole country. The Qin Dynasty appointed the best generals in the Warring States period, such as Wang Jian and Tian Lei, and there were also a group of excellent advisers, such as Zhang Yi. At the end of the Spring and Autumn Period, there were no really top talents in Lu, and even some talents were not employed in China, but defected to other countries. ?

In addition, there is a very important reason that Lu's geographical location is not conducive to its outward expansion. Both Lu and Qi are in today's Shandong Province. During the prosperous period, Lu once competed with Qi for the hegemony of the East. However, with Qi's economic strength and military strength, Lu has no room for expansion and needs to constantly guard against Qi's attack, which is very costly to its own national strength. After the early Warring States period, Lu was in the state of Qi. ?