This is pretty straightforward an explanation. Thank you for taking careful care to expand on skin tone decisions coming down to timing of weekly issues and episodes. The hangups people have about the race of actors gets gross really quickly and they contribute nothing to discussion about the work or adaptation.
This such as cope, Nami and Nojiko and sisters yet they are a different race? If Oda doesn’t care about skin tones in the toei anime then why did he change Nico Robins skin tone to be much lighter post time skip? Why didn’t he just leave the original skin tone that was used pre time skip?