Indo-European poetics, when examined in sufficient depth, provides an answer. There is an obvious Avestan congener nairiio-sangha. In addition, Watkins, How to Kill a Dragon (1995), pp. 90-92, discusses various Greek parallels which combine aner "man" and kekasmai "be pre-eminent". Watkins' treatment, however, focuses just on "praise" as part of the Indo-European poet's image and presentation of himself. Drawing in part on my paper "Greek Kosmos 'Order, Arrangement' and Indo-European Poetics", in Actes du XVe Congrès International des Linguistes 4:15-18 (Sainte-Foy, Québec, 1993), I show that the idea of some appointed position among men, illustrated for Indo-European *kens- in Greek passages such as Odyssey 7.153-157, is also important in Indo-Iranian. Yasna 17.11, for example, connects Avestan nairiio-sangha with a reference to royal lineage.
Vedic narasamsa is also regularly associated with a proper sequence into which Agni and humans alike fit. As a result, Agni, when properly praised by the Vedic rishi, is indeed a divine mediator.