Final answer:
Fitzgerald's characters, like Gatsby, are portrayed through unique, singular narratives that underline individuality and personal journeys, diverging from others in shared motifs such as money, unattainable love, and identity.
Step-by-step explanation:
The significance of the three on horseback not waiting for Gatsby in F. Scott Fitzgerald's narratives reflects a recurrent theme in his work, emphasizing the characters' individual journeys, identity, and the unattainable. Through Gatsby's story, uniquely narrated, Fitzgerald showcases the protagonist's distinct path in the midst of others whose storylines diverge, thereby underscoring the theme of individuality amidst collective motifs of money, unattainable love, and individual identity.
This individuality also resonates in other stories by Fitzgerald, where characters like Jane Withersteen, Tull, and Jerry Card are dissected through their singular experiences and emotional landscapes, whether it is in a passionate escape, an encounter with a crow foretelling doom, or a high-stakes horse race. This narrative choice supports that Fitzgerald's characters do not stand for broader societal figures but are presented through singular narratives that are both individual and universal.