I notice the only cover with an author popular enough to have their name bigger than the title of the book is One Telling Ten Thousand by Isabella V. Rivera which does seem to go against the whole boys club feel of Science Fiction of that time. I think it would have been more likely a gender neutral name like Andre Norton's, maybe Kim Rivera or V. Rivera.
right, big font authors are big font because they are popular, so Isabella was chosen as a popular author's name, but most of the big font authors had male names (or unisex); Octavia Butler was from a later generation than these books are supposed to be from.
