Where are you seeing Armando make a mistake on the second goal? I don't think anybody in the backline was at fault for that one, the play happened because Dax and Alexander were way out of position in the far corner of the field and nobody moved to cover their space.
Alexander's weak cross was cleared and you can see that both Sam and Steele had moved into the box, leaving nobody in a position to defend a counter.
Look at all that space, and not a single midfielder in sight! Vancouver played an excellent counter but its inexcusable that our midfielders couldn't even make it back into our own half by the time the shot was taken.
I've said it before, but Dax needs to plant himself in front of the center backs. Nobody else is going to track back. It's not pretty, but he needs to just hang back there and destroy.