The competitiveness between Iewah's children was not, contrary to what most believed, an irrational and blind impulse. After all, if it was, any encounter between them would culminate in the death of one of the two parties.
Each of Iewah's children could recognize one another thanks to the presence of their systems, and at the same time, they would feel the system's development the same way a cultivator would feel whether his opponent's power was at a stronger, similar, or lower level than his own.
Simply put, Iewah's children would pick their own battles, as they cared more about survival than fighting a battle which they had no chance of winning.
Similarly, those who were too powerful, would sense the low level of development of others, and let them grow until they would become valid opponents.