Most people that knew the White Duo considered Shai'ya to be the weakest.
However, that was far from the case.
She had two S-Tier Skills that were mainly for destruction and absolute annihilation, making her perfectly adept in combat.
Yes, Kat'erin's abilities were much rarer, and was also a lot more versatile—especially [Dragon Voice]—but even she knew that when it came to a fight, there were very few Generals that could stand up to her, and she wasn't among them.
Her two Skills were too powerful to be properly countered—especially if they were used simultaneously.
[Absolute Blood Control] allowed Shai'ya to freely control the blood of her target, even at very long distances, and to also manipulate blood freely. She could even manipulate her own blood, applying it to several uses; including the improvement of her already high physical abilities.