Both brahmanas were pure Vaisnavas. The younger man took special care of the older one simply to please Krsna. In Srimad-Bhagavatam (11.19.21) Krsna says, mad-bhakta-pujabhyadhika: "It is better to render service to My devotee." Thus, according to the Gaudiya-Vaisnava philosophy of Caitanya Mahaprabhu, it is better to be a servant of the servant of God. One should not try to serve Krsna directly. A pure Vaisnava serves a servant of Krsna and identifies himself as a servant of a servant of Krsna. This is pleasing to Lord Krsna. Srila Narottama dasa Thakura confirms this philosophy: chadiya vaisnava-seva nistara payeche keba. Unless one serves a liberated Vaisnava, he cannot attain liberation by directly serving Krsna. He must serve the servant of Krsna.