When Metrolinx took over, they tried to change it from a portal east of Brentcliffe, to just tunnelling all the way to Don Mills Road. But they encountered community opposition about dropping the Leslie stop in the EA amendment process, and with TBMs already in the ground, they cancelled the EA amendment, and just stuck to what was written. These days they'd do it differently, but this was the first project of it's type, and I think they were still gun shy from their mismanaged Blue 22 EA in Weston.