I solely agree w/ your concepts. Gratuitously obvious bad guys get a old very fast and by keeping the evil subtle, it is in my regard that the evil is ten times more evil than your common walking, blobbish, cannibal monsters. Granted obviousness can be fun, but your ideas are very interesting and original.
I'm still fidgeting w/ the concept of a servitor of pestilence who looks like a normal innocent child and your ideas somewhat mirror my intentions for my game. Tre' cool.
-Guy