Appendix A6: Noise and Vibration Assessments - 2 and 3 have what Metrolinx called the ULTIMATE CAPACITY SCHEDULE for the Stouffville and Lakeshore East Line. Link A6-2 p.144 and A6-3 p. 153
One of the benefits of using the existing TTC trains on Sheppard is that when Line 4 is extended west to Sheppard West it can connect to Wilson yard providing another way to dispatch trains to the Yonge Line.
Only one (route 32) head north from Finch GO Bus Terminal. 67 also technically went north after getting onto 401. All the other GO buses go down to 401 and head east-west.
https://www.yrt.ca/en/schedules-and-maps/service-changes.aspx
Another around of service reduction, including those that just got service increased in September.
The bus terminal is not directly adjacent to Eglinton Avenue(slightly to the north), so maybe there is space for escalators directly from Ontario Line to the concourse. (see the image)