When two nations tie for first, the Troop Valeriano will not appear in any nation. This creates 2 problems. First, Nokkhi Jinjahl will not appear, which means what few woodworkers there are won't be able to stack bolts and arrows. Second and worse, Ominous cloud will not appear, which means woodworkers cannot stack Shihei. This doesn't hurt just Ninjas, but anyone who uses this common support job.
This situation, while uncommon, hurts both the producer and the consumer whenever it occurs Producers cannot stack their product, making selling larger quantities awkward. This hurts consumers, as the scarcity of stacked ammo and shihei drives prices up.
SE has come to understand the importance of easing inventory management over the years, and is always making progress. Stackable Crystal Clusters is an example of their ongoing commitment to this. Stacking ammo and shihei is essential, and cannot be left to chance. The easiest fix would be to create new, permenant NPCs that perform identical functions. Another fix would be make a conquest tie for first place impossible. The former approach seems easiest.