The fact that the contracted beasts were all divine rank distressed the Nalan clan greatly.
When they became Spirit Paragons, they could barely summon one or two higher ranking spirit beasts, but she could already summon a handful of divine rank beasts, this was simply unacceptable!
Especially since the younger generation of the Sima clan were all very capable, as compared to the Nalan clan, they were definitely stronger.
In the span of two years, Sima You Yue had risen through the ranks, through the process of going from being a Spirit Overlord to a Spirit Saint, Ya Guang grew along with her.
The same went for Sima You Yang's contract spiritual beasts, because of their contract based relationship, they grew whenever their owners grew.
The divine rank beasts that were resistant to being contracted then, were grateful to have been captured. Rising through the ranks was as easy drinking water, how wonderful!