I'm sorry, but I didn't understand this, nor could anyone explain it to me. This question also floated around in stands around me, and no one knew.
In the last 7 or 8 plays or so, they announed on the P.A. "Saskatchewan has declared #57 (I believe) is ineligible on the next play". And it was repeated over and over. Well #57 is Parenteau and he was born in Quebec, so there went my theory on the import rule.