I really like this post and think it brings a lot of clarity to this topic.
With regards to the mids, do you not suggest people start out with something a little less stable? Even in the "Choosing the Right Golf Disc" article (which is a great read), Blake suggests starting out with something even less stable than a Buzzz or Roc. I didn't do this when I first started playing and really wish I did. I have found these molds to be among the best teaching discs and cleaned my form up so much. I believe he referred to them as "Neutral Mids" (e.g. Comet, Shark, Fuse, Element, etc...).