Disclaimer: The author owns neither FFVII nor KH.
Cloud disappears first, but no one notices because Aeris and Sephiroth are gone shortly after. Then Tifa follows, and Cid and Yuffie. It's about a month according to the weird, post-Heartless calendar that they're keeping when everyone else meets at Hollow Bastion and admits that it's been a week since the last time they saw any of the Gaians. King Mickey is first to express his worry.
"There's nothing we can do, just keep an eye out," are the word that Leon ends the meeting with.
Ultimately, it's true. There is nothing to be done until they find more information. Everyone agrees to look, but every planet has it's oddities and Gaia's is the sentience of the planet itself. Not to mention the Goddess, Minerva; the Cetra; WEAPONs; and summons. For all they know this could be related.
During the meeting it gets established that no one there actually knows if Gaia every really got overrun by the Heartless. Rikku asked why else they would have been at Hollow Bastion, Traverse Town, and the Colosseum before they point out that Gaia was also one of the few planets with experience with pre-Heartless space travel-not to mention hostile extraplanetary lifeforms. That's still not a good enough reason for them to have been around, but it's the best they've got and, really, so many things could be a result of the sentient planet and they just don't have enough information.
