The York teamways aren't a pre-requisite for opening the York concourse interior, as long as the interior is substantially complete. The city can still hand over the interior, while still continuing to work on the teamways.
The Bay teamway area is a bigger mess than the York teamways. Here, the York teamways no longer has gaping holes in the ground anymore. It's just mudflat only, with dumpbins, no holes in the ground. Move the dumpbins and materials out of the way, aggregate & concrete it over, and you're done -- teamways become walkable within a couple months, if they wanted. Look at how hole-less York is now. They can keep construction ongoing in the teamways even as they open it to pedestrian traffic, much like how the Bay teamway areas are a mess even though we commute through it. I think by the time they open the York concourse, the York teamways will be more functional and tidier (even if construction still ongoing) than what the current Bay teamways are.
Just as long as the interior is real nice and essentially done.