Yeah, I would say trying to study defense is going to be too difficult considering it doesn't really have any means to truly quantify defensive presence unless I were to have Supporter. As it stands, I don't have Supporter and even if I were to have it, it would take a great deal of time and effort to go through each line used by the game engine and analyze it. For now, these rankings will have to suffice. It's all for fun anyways. Once I obtain my degree in mathematics, I should have a better understanding and idea of how to obtain better accurate rankings.
Keep up the chat. This forum has been dead for the first time I joined this league and I don't think we've ever had any actual discussion regarding these rankings before like you and I are having. It's good to chat with you.