If you look closely at the video posted in the Michael McGrath interview:
You will notice that there is a short, 1s building raised between say, the beginning of the clip to the 0:08 mark. It will be incorporated to the podium later on - and I think it must be vehicular access point or whatever. That's what the slab is for. Wish I have a site plan to confirm.
Far too expensive to add a south platform to the Bloor line station: it's entirely under the Hudson's Bay Centre. Nothing to do with One Bloor.
Where is the money for a billion-dollar project supposed to come from? The politics for spending a huge amount on an incremental improvement to existing transitThis is another example of TTC having no vision when they know there is a major issue there now with the current setup, let alone 20 years from now.