Monster DNA and human DNA almost seem like separate things imo. Sure, there's the fact that the MC isn't a perfect split because Syla had to edit herself just enough to conceive, but honestly that could still be explained by saying that she had to edit her monster DNA. So from a monster/spiritual DNA perspective, the MC is 50% Body, 49% Memory, 1% other (which allowed him to be born in the first place), then from a human/physical DNA perspective, the MC is half human, part seahuman, and part Silat. I feel this explanation makes the most sense, considering what we know. Like, we know the MC can change people's DNA, but that doesn't enable him to change the abilities of other superhumans, so a distinction should be drawn between the physical DNA that makes up an organisms phenotypes, and the organism's spiritual/monster DNA which affects their abilities and Apostle percentages.