It's interesting. I see a lot of setups and they are all over the place. Doesn't seem to be a constant in where people "generally" have their flashes.
Some use two white screens up front as a base with a flash after each. Others one base, one flash, and the top white last. Others put black halftone last.
In theory, I feel like I would do this.
Base,
Flash,
Cool if able.
Up to 6-8 colors wet
Then flash all of those for any last detail.
But first, I'd consider the size of each element in the color. How much color? This keeps a leash buildup....and is why I'm not always consistent on color sequence. I may request the yellow to be printed last while darks are up front. Depends on how much yellow and if it's to be a large or small area. Also depends on if I need it to be bright or to bury it and blend more.
Not so much about light to dark or dark to light.