not sure if this is in response to my posts, but just to make sure:
my arguments were not: "omg, setons players are so good on setons, they'll crush anyone else w/o 100 hours of games there"
but instead: "omg, purely setons players are so bad everywhere else, that them suddenly playing at medium competency on setons will unintentionally unbalance games horribly"
So I guess I mostly tried to express the problems highly specialized knowledge can cause.
I guess we'll see if I'm right to be worried or not, but I believe it's at least worth thinking about