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X-men story out of x-men issue 166.
Characters without a following often have their biggest moments in other peoples stories.
Marvel currently trying to push Elsa Bloodstone as a big name too, Putting her in midnight sons comics, werewolf by night comics, and werewolf by night tv shows. but nobody buying any solo elsa material.
claremont wrote danvers into the xmen as much for her relationship with wolvie as her CIA/government credentials.
ain't nothing wrong with that..
claemont liked cosmically/elementally uber powered females and carol was yet another one to add to storm, jean, polaris ... rogue.
it's not just about the comics it's about the creative team as well.
that is where the notion of "classic run" comes from.
supes was boring until byrne took over.
thor was boring until simonson.
FF was boring until byrne.
xmen was dying until claremont.
daredevil .. until miller.
spidey .. until romita.
.... you get the picture.
details example:
"The title [x-men] lagged in sales behind Marvel's other comic franchises. In 1969, writer Roy Thomas and illustrator Neal Adams rejuvenated the comic book and gave regular roles to two recently introduced characters: Alex "Havok" Summers (Cyclops' brother, who had been introduced by Roy Thomas before Adams began work on the comic) and Lorna Dane, later called Polaris (created by Arnold Drake and Jim Steranko). However, these later X-Men issues failed to attract sales and Marvel stopped producing new stories with issue #66 (March 1970), later reprinting a number of the older comics as issues #67–93."
X-Men - Wikipedia
en.wikipedia.org