Sounding Stream
The explanation for having two skills makes no sense. Either it’s based off body. In which case only MC soul is here. So only 1 skill (dead guy’s). Or soul. If guy died and MC’s soul took over body. 1 skill (MC’s) If guy’s soul (not just memories) fused with MC’s soul. 1 skill (guy’s skill and MC’s skill would combine) MC hijacked the body but the guy’s soul is still in there, separate. 2 skills. But the guy’s soul might struggle and prevent MC from using his skill, or even controlling the body properly.