Keep in mind that unlike YQQ, the scope of YCD connections isn't just turning around back to YVR on the same plane. There are YYC flights as well as a seasonal YYZ flight, and I've seen YVR-YCD-YYZ routings offered for sale (not sure about YYC-YCD-YVR or vice versa). The departure of the YYZ flight is also when the airport is most swamped and without an actual connections procedure, the relatively high MCT may actually be a deliberate choice.