Seniority Succession - Younger candidate first?

[Quintillus]

A question about succession law that I couldn't answer from the Internet, manual, or game. I am the doomed Queen Zarpanitu, the last of my side of the family, with two potential successors, Princess Hama and Duke Shalmaneser. This game has agnatic-cognatic succession, though I understand that proximity takes preference.

I'm trying to understand why the "Seniority" and "Dynastic" (oldest direct line from founder) laws favor the 7-year-old Duke Shalmaneser, while Ultimogeniture does not. Hama is older by half a century, shouldn't she be the Seniority winner? Or does the agnatic-cognatic interfere with that? Similarly for "Dynastic", I'm not entirely sure how "direct line from founder" is calculated.

I figured I'd have to spend 10 legitimacy to make Shalmaneser my heir, with the goal of my 100 personal legitimacy not being watered down as quickly since he will likely live far longer than Hama, so it's convenient that I don't have to.

 

[InsidiousMage]

Or does the agnatic-cognatic interfere with that?

I'm pretty sure it does. If I remember correctly, its male preference so if there is a viable male heir, they will always be second in-line before any female candidates, regardless of other considerations.

 

[Quintillus]

I'm pretty sure it does. If I remember correctly, its male preference so if there is a viable male heir, they will always be second in-line before any female candidates, regardless of other considerations.

But Princess Hama is the preferred candidate for Primogeniture and Ultimogeniture. I haven't reconciled why it would interfere with Seniority/Dynastic, but not those two. Unless the order has something to do with Hama having already been in line before her half-brother Ushpia was legitimized?

 

[InsidiousMage]

Unless the order has something to do with Hama having already been in line before her half-brother Ushpia was legitimized?

I've haven't really messed around with different inheritance that much in OW but that might be it. Also, was Shalmaneser born before or after his father was legitimized? That might also have something to do with it.