This wasn't a rare instance. The birth of a True God practically guaranteed such an event. Just a few ten thousand years ago, the Shruti Clan was actually ahead of the Atlas Clan on the rankings, but a single True God flipped everything on its head. This was the value of a True God.
But now, the Clans had gained an opportunity to grow close once more. The Atlas Clan had birthed a True God of the last generation, while the Shruti had finally birthed one of their own in Saru. If both Clans used their past relationship as pretense, they could form a strong alliance headed into the future.
Wars within the tower quadrants was frowned upon and only allowed within one's own quadrant. Intra-quadrant warfare was prohibited. Or else what reason would, for example, the Diasho Clan have to not claim the easy Faith that was the 100th ranked quadrant?