Sorry to make a separate post for this, but for some reason the site won't recognize my attempts to comment on the original post at any length (it keeps giving me an error message). However, I found the essay interesting and thought-provoking, and wanted to respond somehow. So I'm writing a separate post - I hope this is ok.
Janus:
As I said in my short comment to your post, this is a very interesting essay, with a perspective I haven't come across before. On a number of points I agree with you, particularly about using real emotions as a method of occluding, creating a 'face' for the legilimens to see. It accords pretty closely with my understanding of Sev's Occlumency. And yes, he is a complex man full of contradictions - verbally brutal to his students, yet willing to charge into danger when he thinks they're hurt, full of resentment and hate but also deeply loving, a DE and a member of the Order, etc.
However, I do have real questions/confusion on some points. Please don't feel attacked - I agree with you on some things, and for the rest I honestly am interested in hearing your response. I guess I'm trying to get a better understanding of your Sev's psychology. Please correct me where I misinterpret things!
This might be pretty long.