The episode is set in the earlier phase of David’s rise, when he is operating from a “stronghold” rather than from an uncontested royal center. People from Benjamin are noteworthy because Saul, David’s rival king at this time, was from Benjamin, so Benjamite arrivals could plausibly be genuine defectors or potential infiltrators. The setting assumes real risks of espionage, shifting loyalties, and small fighting bands rather than settled national institutions. Within that kind of conflict environment, David’s reception of new support is cautious, public, and tied to demonstrated intent.