Faced with this situation, he could choose to intervene and profit from it.
In fact, if successful, the benefits would be considerable. Usurping the imperial power and ruling the entire Alliance might be difficult, given the lack of prestige; there will be significant opposition from both the masses and the Nobles. However, he could take a step back, support someone allied with him politically to become the New Emperor, while he remains behind the scenes, manipulating the political scene with his latent influence, becoming a figure akin to the Duke of National Guardian.
This process might take several years, with many risks involved, but once completed, he could mobilize the continent's largest nation for his own use.
So, is it worth it?
He had seriously asked himself this question before.
