IIRC it was reported that the capacity for the 2016 Grey Cup is going to be around 40,000. The leafs announced yesterday that they will be playing the Centennial Classic at BMO Field and the article from The Hockey News says that the capacity for the Centennial Classic is going to be 35,000.

Shouldn't the capacity be more than the Grey Cup since a NHL Rink is much smaller than a CFL Field?