wagsjr- I never tried the 05937/rotary/finishing pad combo but based on what I've done with 05937/rotary/*light* polishing pad I think it'll still do some correction. The polishing pad I used didn't contribute any cut of its own yet I was able to remove some marring from Audi clear. IMO the 05937 would be safer on thin spots than the #80 but that's *just* my gut feeling.
I've done entire vehicles with just 05937, most notably the WRX I used to have. Didn't even use a rotary, yet I was able to remove all the marring except for a few deep scratches that I'd rather live with (than thin the clear that much) anyhow. It did take mutliple passes in some spots but I didn't have to spend forever at it. IMO it'll depend on how severe the marring is and how hard the paint is.
As best I could ever tell, the stuff for light/dark cars is only different with regard to the pigment used to tint the fillers. No *functional* difference that I could discern, at least not with regard to cut. While I wouldn't use the "dark" stuff on a white car, basically you'd never know the difference.