Like Cres said...all those things to think about. Not even sure they need to be addressed in a single book (assuming that is the ultimate goal). For instance (pardon my novice attempt at giving advice...it really springs from what a reader might like to see), the main character could be in, say, five books. And he runs the gamut of being a cold-steel hunter following the edicts of his job. But, from book to book, he begins to question things...just like the things that Cres mentioned.