The comparisons I used are for media that are similar in many respects to the graphic medium, but credits work the same for other creative endeavours and to other pursuits. But one of the most important forms of acknowledgement was left off 'books' for some while.
Perhaps the sensitivity over the company retaining royalties and being seen to be the owner of a creative property, led to this decision to keep the originator of a character or a series hidden. I daresay some are even now lost to history.
Thankfully it has since become common practice to include the names of the creator(s) under the title on the splash page.