WI: The Ōuchi Clan didn't fall

The Ōuchi Clan was one of the most powerful Daimyo clans in the early Sengoku Jidai. Claiming descent from Baekje Royalty, at their height, they controlled six provinces in Western Japan, and the city of Yamaguchi was seen as the "Kyoto of the West" being a hub of culture and trade with China. One of their most ambitious plans was under Ōuchi Yoshitaka, when he planned to move Emperor Go-Nara and the Imperial court from Kyoto to Yamaguchi.

However, it was also under Ōuchi Yoshitaka, while culturally and artistically flourishing, militarily the Clan wasn't doing too well. They lost the Siege of Gassantoda under the rising Amago Clan, while also the Mori Clan in Aki Province was on the rise as well. This made a lot of the more Militaristic samurai, such as Sue Harukata (A descendant of a cadet branch of the Ōuchi Clan, called the Sue Clan) launched a coup against Yoshitaka, called the Tainei-ji incident. Harukata would install Ōuchi Yoshinaga (Who was actually Otomo Sorin's young brother) as a puppet. This caused Mori Motonari to rebel against Harukata, defeating him at the Battle of Miyajima, and making the Mori Clan the dominant power in Western Japan.

The Ōuchi Clan would then fade out, although a branch family called the Yamaguchi Clan would survive into the Edo Period.

What if the Ōuchi Clan didn't fall? What if they remained a power in Western Japan? How would this effect the Mori Clan, or even the Otomo Clan?
 
There are multiple ways the Ouchi clan could've survived but the best one would actually be Harukata defeating Mori Motonari at the Battle of Miyajima. The Mori clan would've subsequently be conquered or they would be forced into vassalage once again. From there, Harukata could attack the Amago. Without a soft and courtly leader like Ouchi Yoshitaka being a weak link within the clan, I think the Ouchi could've defeated the Amago. From there, they could easily march onto Kyoto with their vast territories and monopoly over trade with Ming China.
 
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