The imagery of the Zodiac members departing one by one symbolizes the end of a stagnant era.
The absence of Kyo’s Juzu beads visually confirms his metamorphosis from "monster" to man. Fruits Basket: The Final (Dub) Episode 13
To dive deeper into specific arcs or the production history: to the 2001 ending or the manga's final chapters The imagery of the Zodiac members departing one
The physical departure through the Sohma gates signifies the transition from a cult-like isolation to the vastness of the real world. Fruits Basket: The Final (Dub) Episode 13