If he fights Haken alone, he naturally won't gain much advantage and might even be suppressed.
Haken's formidable defensive power, massive body, and extremely combative dragon form already provide an astounding advantage in battle.
And the role of Yaya, besides binding him as now, is more about sealing and purifying his nest.
Of course, inside Haken's nest, there is stored a tremendous amount of power and twisted sacrificial divine power.
Even though Yaya's talent is special and energy powerful, inherently capable of restraining these twisted powers, handling them thoroughly in a few hours is still a challenge.
In fact, what Yaya is doing, under Matthew and Yaya's cover, is to seal most of the power inside the nest as quickly as possible, forming a temporary trap.
As for how to isolate Haken's control and absorption of these powers, it's simpler than previous actions.
The deeper the understanding of these powers, the clearer their characteristics become.
