Who left the keyblade in Destiny Islands and why?

[cakito123]

Was it Aqua? She's without any keyblade VS Ansem's before in the game, and that's why she lost the battle, and I thought now that maybe she 'sent' Eraqus Keyblade there to Sora/Riku/Kairi to find it someday?

At first I though Sora used his -improvising power- and summoned this keyblade in Destiny island, but playing it again the 4th time, actually think it was Aqua... And sora finds her Keyblade/Door.

But is there any official explanation who left this keyblade in Destiny Island? And why?

 

[Zettaflare]

At the end of 0.2 Aqua and Eraqus' Keyblade were just lying on the beach(separately) while Destiny Islands was being restored. The general assumption is the the Keyblade returned to the realm of light along with the Islands while she remained in the Realm of Darkness