Unfortunately, as
@EastYorkTTCFan points out, it's not accessible to anyone in a wheelchair due to the lack of elevators. Given Mx seems to be moving towards double elevators for main entrances (and access to platforms) in many of their recent plans and renderings (including the rendering of the relevant Osgoode Station entrance), that's likely a big reason for the size of the proposed pavilion building. While there is one current accessible entrance to Osgoode, it does only have a single elevator, so anyone who is disabled is out of luck when it breaks down. Also very likely these elevators will access both the Line 1 and Ontario Line concourses, as opposed to the current one which would need major work to be extended down to the Ontario Line. So unfortunately, aesthetics aside, the entrance needs to be a pavilion building. It's just a matter of where to place it.