^fair enough.....but that means (if i understand it correctly) if you arrived at T3 you would not use UP? How long a walk (and therefore how close to existing terminals) does that "true multimodal hub" have to be? Is there land that close (to both terminals, I guess) to build such a hub?
Can't imagine there isn't enough land - plus underground. In any case, some hubs are more important than others, and proximity to ACC really shouldn't be the driver when it will compromise the user experience from Pearson - think regional, not local.