Then comes Forever and the rest of FF through the end of Hickman's run
Fantastic Four and FF came out monthly after this, so it's a continuing story in two books. If you alternate starting with Fantastic Four #600 and FF #12, you should catch up all through the end of Hickman's arc. If I remember correctly, Fantastic Four came out before FF during the month, so alternate between Fantastic Four and FF.
When you become the top editor of a page, you take some ownership over it's content to a certain extent. If things are incorrect or just plain look bad, you take care of it (this should be for any page you find actually). When you do suspect an editor or abusing pages, including general misinformation or point spamming, let the mods know in a PM,
Well, one of them is an alien who was sent to Earth from a doomed world that was raised by kind Earthlings and later learned of his true origins and great powers to fight against evil on behalf of his adopted planet, and the other...
Before he had heralds, Galactus created a program that spread throughout the universe. When it arrive at a suitable planet for him to consume, it would seed in an intelligent being, who would in turn create a robot capable of absorbing the Power Cosmic and destroying any defenses the planet might use to try and stop Galactus from consuming the planet. Basically, a way for his to save energy from swatting flies.