When you apply to medical school, the majority of you will consider it a success if you get admitted regardless of where you will have to spend the next four years. Sure, a small proportion will actually have to (ehm-ehm) make a choice, an even smaller group will be so set on a specific school that they will actually refuse an acceptance from anywhere else, a minute bunch will not even apply country-wide. For the rest of us, admissions will indeed be a victory, because any Canadian university grants the same MD degree that will allow you to work anywhere in North America and then some.
Keeping that in mind, you have to understand that admissions committees, aka the people that will ruin your life, aka the people that will make you wet your pants from joy are considering many more candidates than they can accept. Obvious? Great!