[TokuKnight89]

Seen Kamen Rider World more than once, including a re-watch a few minutes before this posting (I'm aware that this could be construed as a cheat and I am intending to get the Media Blaster set), and something finally clicked for me: Despite ZO's inclusion, there isn't a single thing which technically links ZO to the special! Shadow Moon and his revived Kaijin link to Black, RX, Shin, and J. No ZO Kaijin are included. His appearance is mainly because he's a recent Rider innovation and because they were trying to set-up J and ZO as the new "Double Riders" (a phrase Shadow Moon utters in World to refer to them both collectively).