In case no one posted it on Pizzamaking.com, world champion Shawn Randazzo posted a video () a couple of weeks ago, describing and demonstrating how he makes his Detroit style pizzas.
Some interesting points:
1. It looks like he is using only one kind of cheese (or cheese blend) all the way across. It doesn't look like he's putting one kind of cheese around the edges and another in the middle.
2. He puts the sauce on after the bake, saying that it allows the other ingredients to bake more evenly. Also, he warms the sauce.
3. Most interesting to me, the video shows him putting the pie, in the pan, in the oven, which is a deck oven. But when he takes it out, the pan is gone. Apparently, he takes the takes the pizza out of the pan at some point and lets it bake on the bare oven surface for a bit - I would guess, to make the bottom crust crispier.