Violet is going to end up doing exactly what Xaden did for her in Book 1
We know Rebecca Yarros said that in Book 4, Xaden is going to be in his "villain era", even saying to skip to Book 4 if they don't want to see him that way. This heavily implies he leaves Navarre's military behind and returns to the good side by Book 5 or turns good at the end of Book 4 as he would no longer be in his villain era.
But because he left as a Second Lieutenant, he will likely have to start completely over at the absolute bottom of the ranks if he rejoins. This timeline makes sense, especially since the Empyrean is set up to be the major overarching villain of the series, meaning Book 5 will likely be dedicated to them, not just the venin.
Meanwhile, we have already seen Violet step up into major leadership. When she gave her speeches in previous books, both Brennan and Xaden openly said she has massive leadership qualities and could easily be a duchess, a public speaker, or a political leader. It proves she has exactly what it takes to be in commanding roles once she graduates. However, we don't know how long Book 4 will span, but fourth wing covered an entire year. If Book 4 covers several months or features a significant time jump while Xaden is away, it gives Violet the perfect window to graduate, fight on the front lines, and rapidly climb the ranks.
If Xaden is actively working with the venin, the military will desperately want Violet on the front lines for her signet She would naturally take on a massive role trying to stop the war, wielding her raw power both for the kingdom and to save Xaden. Plus, as the war escalates, massive power vacuums will open up as high-ranking officials die in battle. Because Violet is a massive war asset, and if she takes on more leadership roles she could get promoted incredibly fast.
So if Xaden returns to the military in Book 5 as a baseline Second Lieutenant, violet could end up in Xaden’s chain of command.
Narratively, it would come full circle as Violet might do exactly what Xaden did for her in the beginning. She could request him to be placed directly under her command so she can personally vouch for his loyalty, mirroring how Xaden protected her when she first found out about Aretia and the venin.
This would also protect him from top tier leadership. If Generals like Melgren find out Xaden is venin (which Melgren easily could, if he sees a future battle where Xaden is fighting on the enemy side), they will want to execute him for treason. Violet pulling rank is the only way to shield him.
It would also be incredibly funny and satisfying. Xaden has always been the one with the power in the relationship, he held the secrets, knew things she didn't, and completely outranked her. Switching it so Xaden is suddenly in Violet's position,where she has to look out for him, tell him what to do, and order him where he can and cannot go,is the ultimate narrative reset. I’ve not seen anyone else discuss this but what do you guys think?