Excluding the U.S. gates, can any security entrance be used to get from checkin to E gates or D gates? I flew on COPA in August and was shuttled to this minuscule security checkpoint where 98% of people were on Sunwing or similar and the CATSA clods were putting non Nexus through Nexus in the whole two open lines.

I recall on my AC departures the gates are more plentiful and they honour Nexus. If one were to use those for a E flight can you get to E from what I guess must be D gates?