Kingdom Hearts II Tidus, Wakka, and Selphie?

They were residents of the Destiny Islands with Sora, Riku, and Kairi, were they not? Isn't it possible they lost their hearts after the Islands' descent into darkness? I know Selphie showed up in KH2 after their reformation, but, I mean, Kairi lost her memories of what happened to her. Couldn't the same have happened to them? What if they actually became Heartless/Nobodies? Would anyone know? I found this an interesting fact.

 

They did lose their memories of Sora like Kairi did at the beginning. That's why Selphie said "Are you sure you aren't making him up?" when Kairi asked about 'the other boy'.

I'm pretty sure Tidus and Wakka were the same.

 

Ageed. Although you do make an interesting point about them turning into heartless/nobodies.

 

tru it would be funny if hayner and the gang were their nobodies