I’m flattered that you think of me when it comes to Detroit-style pizza! I’m far from an expert, and I’ve learned a lot from a lot of people over at pizzamaking.com.
First, to address the OP, although I fear I may be late:
It will break the dough. The gluten will make the dough pull back into itself. Letting it rest lets the gluten relax, and you’ll be able to spread out out a bit further. Five minutes probably isn’t necessary, but his point is, it takes a long time to spread the dough without breaking it, and this might be counterintuitive from his video, because it’s a very high hydration dough, and working with it, you’ll think: this should be easy!
Maybe a few days. The yeast will continue to ferment. You can freeze the dough, though, and it should revive quite readily. Or you can halve the quantities.
The OP having been addressed, I pegged the guy as a Canuck as soon as he started mixing units, and looking at his channel, he’s from the GTA. If he’s ever in SE Michigan, I hope I can invite him to The Cloverleaf in Eastpointe (my treat).
One thing, though, is he uses volume measurements for everything; weight is much better. My preferred recipe (should be googleable) is all baker’s percentages.
The pans he has look exactly like mine, and yes, they are important. I got my at [url=http://roselliwholesale.com/]Roselli’s[/ur], but it looks like he got his online somewhere.
I’ve not found a good source of Wisconsin brick. I’m jealous that some dude in the GTA was able to get some, and I can’t. I’ll usually use some white Cheddar – mild – with a bit of mozzarella (not the fresh stuff!) and Parmesano mixed in.
Of his two pizzas, the most “authentic” is the second one. The cheese always goes directly on the dough, because the dough and cheese fuse into this awesome, well, fusion of bread and cheese. He also mentions that the second is based on a pizza called “The Detroiter,” which is my favorite when I go to Buddy’s.
For authenticity, sauce also always goes on the top. I give an out to Jet’s Pizza for this, because other than the sauce not being where it’s supposed to be, they do a damned good Detroit-style considering it’s fast food.
I probably won’t try Glenn’s recipe, but if I were to do so, I’d want to weigh all of his ingredients to figure out his hydration. The dough looked good, but you need to use percentages for repeatability. I’m genuinely curious where he learned his technique, because he’s doing a damned good job, and if anyone knows him, I’m serious – I’d love to invite him to The Cloverleaf – not Buddy’s – if he’s ever in SE Michigan.