We had to be in the MK at 8:30 for a Capture Your Moment session a few weeks ago. When we got out to the bus stop in front of Pop, there was at least 3 busloads of people in line waiting. We bailed and opted for Uber. I knew there was a chance they wouldn't let us out at the Contemporary and we might get rerouted to the TTC. We got lucky and the guard's magic band reader was malfunctioning and he ended up waving us through at the Contemporary. He might very well have ready to deny us. But I had already told him whey we were there, so who knows.
Anyway, your best bet is to take the bus but leave extra time in case lines are longer than expected.