starbonds are issued for stars of movies.
starbonds are used to measure how much star power they bring to a movie.
starbonds are attached to movies to measure how much star power they bring to a movie (starring role, announcement in trades, appears on the poster, listed on the poster, listed in production materials, listed on official movie website, featured in the movie trailer, (sometimes) featured in movie reviews, listed at the beginning of the movie, listed at end of movie before the rolling credits, behind the scenes stuff, etc...)
starbonds are usually not attached for cameo roles (which are meant to be suprises for the audience) unless they treated as a big deal by the movie studio.
OBLOO was announced in advance as returning to Pirates. The movie plot concerns his character. KKNIG was a cameo part that was not announced and was not known about until the movie actually opened. The movie studio was not using her star power to bring people to the movie. Where and how she is credited in the movie does not matter (because it was likely part of her deal in order to appear in the movie).
Falcon appearing in Ant-Man could be considered a cameo and was not attached to the moviestock until Falcon was shown in the trailer and then it was revealed that AMACK was credited above the rolling credits. Showing him in the trailer was the studio using AMACK's star power (as Falcon) to get people to come see the movie so cameo status was overriden and he adjusted for that movie.
KKNIG was not announced in advance, was only a cameo part, they had to put her name above the rolling credits to get her to make the cameo, ... this does not override her cameo status in the movie and so she should not be attached and she should not adjust for it.
"Silly because you've obviously added or deleted SBs before based on the actual crediting in the actual movie in the past"
Starbonds were attached to moviestocks and are regularly added/deleted as we find out that: their deal didn't go thru and they never actually joined the movie; they were replaced by another performer; their role got reduced to an uncredited cameo; the studio decided not to promote their role because it was a cameo; their role was cut out of the final movie; they were credited using wrong/outdated information; etc...
"but perhaps because this one is easy $H, you're going with a featurette over the crediting in an actual movie. Arbitrary."
Perhaps because this one is easy $H, you are making a big deal about it. There are lots of other starbonds to play with.
You are more concerned about letting people know that KKNIG was in the movie... than the studio was. That is why she will likey not be attached and likely will not adjust.