Just before the pin appears you've placed gear but that wouldn't prevent you from decking on that slab. Yuck!
The gear is all fixed pins until you start back up the crack. And you're right, there was serious swing potential into the corner when you stand on that first #4 stopper placement, and again when you move to the wobbly piton. But the one after that is solid!
I just did the CMC route yesterday, and was looking up at the south buttress the entire way back. I hope someday to climb at your level!
Hey, we were aiding, that makes it easy! I climbed the DSB to the summit a couple of years after this. That is the ultimate Teton route.