Firstly, I am the LAST person here on the forum, to consider an authority on these subjects.
Secondly, I don't have ANY experience par-baking my Detroit-style / pan pizzas.
That being said, my results with straight baking have always seemed more than adequate.
Without getting totally into the weeds, my basic bake consists of these key dynamics:
Gas oven at 500º
Stone on bottom rack.
Other rack second from top.
Fully dressed pan pizza starts on stone for ten-minutes.
Move to upper rack (rotating 180º) and let go for about eight to ten more minutes.
The first half of the bake, on the stone, seems to be the perfect amount to create maximum spring, and start the browning / frying of the crust bottom.
That second half of the bake, towards the top, seems to also promote such good browning of the toppings, that I rarely even need to flip on the broiler. Additionally, being off the stone for the later half also prevents the crust from burning, or getting too hard.
P.S. I always use cheapo Chicago Metallic "aluminized" steel pans.