Carrying on the conspiracy theory of Uriel somehow creating the scenario for Malcolm and Maggie getting in love, I would propose that he also created the chance for Harry to meet Michael and, by extension, other Knights. While I agree with all of you that Malcolm is a significant part of what made Harry a "good starborn" I do not want to overlook Michael's influence. In my opinion, Malcolm shaped Harry because he was with him in his first years. And then, after Harry proved to have the potential to be a force for good, Michael was on his path. I imagine that is what people say "God put him in his path" and it could be true in this case.