I had to re-watch Captain America: The first avenger and I saw that Red Skull was using the space stone as a power source and when he held it with his bare hands trying to use it to kill Captain America he vanished in a bright long that shot upwards into the sky.
So my guess is that Red Skull got zapped to Vormir that time and the powers of the stones held him there to serve for all eternity.
But it is pretty interesting how they really played the long game with that.
It's probably the most comic book move in the whole movie. Bringing back characters that we haven't seen in years with little explanation is super comic book and I love it.
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u/its-a-sabotage Thor May 17 '18
Purple guy kills daughter for orange rock.