Cyrus J. Colter was inducted on the Black Literary Hall Of Fame in 1999. He has a Wikipedia article in Japanese and his Wikidata item has been expanded with a link to Open Library and VIAF
According to a tweet, G. B. Lancaster was once one of New Zealand's most popular writers. When you google her, you find that G.B. Lancaster is a pseudonym for Edith Joan Lyttleton. For Mrs Lyttleton there is now a link to Open Library as well.
From a diversity point of view, both Mr Colter and Mrs Lyttleton represent minorities. Giving attention to either increases the diversity of Wikidata. Linking both authors to the Open Library has the most inclusive effect. There is now a bigger public for the books they have written.