Nomura: After 'KHII'. When he stopped the Organisation's plans in 'KHII', he was caught up in an explosion and blown into the world of darkness. The line where he says, "I first met him one year ago," is referring to before 'he' went to sleep - that is, it's referring to the time of 'Chain of Memories'. It doesn't mean this is one year after 'KHII'.
Oh thank God. I was so confused about that.