we actually do have a “was previously credited to” rel for author-work
also wrt Pen-names as aliases or as separate entries - #37 by anon91644636
I had previously argued (in BookBrainz) that author-author “collaborated on” wasn’t needed. I was wrong!
Clearly this is exactly what to use for pen names that are group or collaboration, or housenames used by a group (is “house” in this setting a publicist or a writer collective? (either/both?))