Examples of creators "annexing" other parts of the Marvel lore?

[Hybrid]

The first entry of Deathlok into the main MU that I remember was back in the 1980s, as part of Marvel Two-in-One's Project Pegasus Saga. Later in the 1980s, he turned up in the pages of Captain America.
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In the '70s, Deathlok had a comic not tied to the main universe that was a sci-fi. Honestly, there's so much legacy, shuffling and inter-dimensional stuff to this that I get confused, but the Deathlok Prime version got connected to X-Men.



Teaching the class.



As part of the X-Force.

[Ultimate Captain America]

Jack Kirby also made the inverted case. The Captain America comic survived the end of WWII and kept being published into the 50s, until it was finally cancelled. Marvel started publishing superheroes some time later, and when they brought Cap back Jack made up the story of him falling in the artic, getting frozen and then revived at the present day. In some variation or another, that has always been the ultimate origin story of Captain America since then. But then, all the post-war Cap comics are not canon anymore.

And there's more. Usually, this event happens at the end of the war. But the first time, Avengers #4, was in 1963 and said that it was "more than twenty years ago". That would be at least 1942... the year Jack Kirby ceased writing Cap the first time. Not only he made the post-war Cap not canon, he made all stories by anyone other than him not canon.

[mung]

Mark Gruenwald taking Maelstrom from Inhuman villain to Quasar's rival and agent of Oblivion,

[DrNewGod]

...Not only [Jack Kirby] made the post-war Cap not canon, he made all stories by anyone other than him not canon.

Until Englehart gave it all back via "Crazy '50s Cap"
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[Force de Phenix]

I don't know what the line is of annexation and Marvel being a company using their characters.

The Sh'iar and Vulcan appeared to be of the X-Men, but had important tie ins with the inhumans. Is that annexation?

The Scarlet Witch example shows that some characters are better in their "annexed" stories than their originals.

[your_name_here]

Iron Fist by Fraction/Brubaker established the Iron Fist was a mantle, and also that Kun Lun wasn’t the only magical city.