It's grand to sit here and state..."this should happen" and "they must do that" but...we still don't know what transpires between the writer-artists-colourist-inker during the production process on any given book.
Yes they do collaborate with each other...that much is obvious...but how often and in what depth is speculative, and as such some details will be overlooked.

Maybe...
It might help to have a Fenty Colour chart to the effect of:

Roberto Da Costa: Tan 430
Storm: Medium 360
Monet: Light 290