I still don't understand why the head house can't be in the 14 meter area between the property line and the university line with the escalators descending east on an angle into the keyhole shaft. It would improve the public realm as well as the, quite poor, connectivity between Line 1 and the OL. It looks like there excavating and building underground infrastructure there anyway...
It would also be wise to cut and cover a short pedestrian tunnel from the simcoe entrance to the Line 1 entrance. Wayfinding is going to be a nightmare in the current layout, with out of towners and less frequent transit users descending 8 escalators to the wrong platform. If you have to put a sign that says "Osgoode station, but wrong door for Line 1" the design is suboptimal.