There was once a thread on Nale and Elan. Specifically, it addressed "nature vs nurture", and whether Elan would have been evil if raised by his father, etc. If someone could find it, it would be very helpful to my point.

Anyway, when this question was asked, the Giant stepped in and put a kibosh on the whole thing, saying something to the effect of "answering this will spoil a plot point that will come later in the comic"

Therefore, I think this is an unresolved plot point; namely, what exactly caused Nale to be evil and Elan to be good? (or something to that effect)