The older man who stood on top of the pyramid wasn't just anyone from the Light Faction. Reno had noticed the clothing he was wearing, the light color with the golden trim around it.
This man was known as Nabi Highborn and was one of the ten elders belonging to the Dawnblade Clan, the same clan that Beatrix had come from.
After Beatrix's loss to the Demonic Faction, the Light Faction could do one of two things: accept the loss and decide to stay low for a while. However, what would that mean for the Light Faction? That they were weaker than the Demonic Faction? Not only that, but from within the Light Faction, the Dawnblade Clan was being pressured, and some were beginning to think that they had grown weak being next to the border of the Demonic Faction.
Essentially, it meant some of those in the Light Faction felt like the Dawnblade Clan didn't deserve to be in the top three clans of the Faction.
