The operating assumption at the moment has been that you need to connect into the major hubs--for example, Union Station, or Central Station in Montreal, or the station here. On whether you could do it otherwise, the short answer is of course you could, if the numbers made sense. They do it otherwise in some places. For example, if you take high-speed rail into Paris, there's not one terminal; there are three, depending on where you're coming from and where you're going. It's not dissimilar in other major cities in Europe, or for that matter in Shanghai. That is not an unrealistic thought.
I can't tell you whether it's being studied in the existing study because I don't know, but if it made good sense and you had very efficient linkages from that node down into the centre of the city, then there's no reason why you couldn't do it.