Yes, but I was responding the original posts claim that Johnny Cash came out and said his wife was black, which was the exact opposite of what happened. His wife being 1/16 African helps the claim that she had maybe a darker complexion I guess, it's hard to tell with most photos of her being in black & white or potentially colorized. I'm also 1/16 Native American and I really wouldn't claim that I'm actually Native American based off of that (though maybe some scholarships exist that say otherwise).
Her being 1/2 Sicilian may have had a bigger impact on skin-tone, but maybe the African great-great-grandmother was a well-known secret in her family and they tried to hide it as much as possible, I don't know. It's probably more important to ask, "Did she consider herself to be black?" Everyone has their own definition of it, but I've not seen anything that says that she actually considered herself as black, but it's also possible she tried to hide it early on given the racial climate at the time. Is the "One-Drop Rule" still valid here?