How can people say it's Mickey? He had his own business to take care of. Probably was either lookin' for Ansem the Wise or doin' something with Yen Sid. Riku was the only available help to Kairi at that time. The Organization (besides Axel) had Sora to deal with. They were just letting him destroy Heartless to build up Kingdom Hearts. It wasn't until Saix knew Axel was after Kairi that the Organization got aggressive and kidnapped her.