for the most part, he included whatever Kato wanted him to. the inclusion of CT and RD themes in the two overworlds were due to a suggestion to Mitsuda by Kato. I'm willing to bet the same with Star Stealing Girl, since Kato probably felt it a good theme for his character, Kid. There's a few ambient tracks that don't really have a place in CC, and the organ piece can really only be included in Fort Dragonia, or Terra Tower perhaps. Viper Manor stays for obvious reasons (because it's in both games in case someone can't figure out lol). No idea about the Lynx themes' exclusion, probably felt it didn't fit the aesthetics of CC as well. Same goes for that ending theme, he was specifically asked to do a vocal tune for the ending. In a way the epilogue theme was in CC because one of it's melodies features in the El Nido triangle undersea bit.