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Because the sub-soul had been resistant before, the Blood Demon had been prepared to use some means to forcibly suppress the sub-soul during the fusion to complete the integration and gain the strength and benefits of the sub-soul.
But to his surprise, the process of fusing the sub-soul went very smoothly, without any resistance. The only thing that puzzled him was why there was a sense that the sub-soul seemed to be taking root in the main Divine Soul.
It gave him a sense that although the sub-soul had fused, it hadn't dissipated. Instead, in some way, it coexisted with the main soul.
Vaguely, the Blood Demon felt something was amiss, yet he couldn't detect what was wrong.
As the sub-soul fused, mysterious runes also merged into the Divine Soul, yet the strength gained from the sub-soul, including the Great Technique practiced by the sub-soul, didn't appear.