Lex is the object Kal imprints on, so he does what he says--at first. Then, he begins to become what Lex wants...and we know Lex doesn't want a mindless minion, no matter what he thinks or says. ;)

Kal hurt because he has can feel physical sensations--he has to. The constructs are meant to be companions in all sorts of ways. *blushes modestly*