Feudalism feels more like Gryffindor to me. It was more about personal authority than about cunning. Not to mention he was the one with the sword.
Personal authority is something that takes rather a lot of cunning to acquire and maintain. A Gryffindor may be claim a territory here or there but his children either adopt a Slytherin mindset their power dwindles or is usurped.
Slytherins by definition lack necessary bravery to keep getting into all fights that maintaining a position within feudal system requires.
As long as acquiring power requires personally charging into an enemy army, Gryffindors will hold most of it. Fellow Gryffindors will be easily impressed by someone who does so without a second thought. Slytherins won't last long. To someone who actually values their life and comfort like all Slytherins do, this is very expensive kind of signaling.
Update: This post has also been superseded - new comments belong in the latest thread.
The second thread has now also exceeded 500 comments, so after 42 chapters of MoR it's time for a new thread.
From the first thread: