The emergence of 6 increasingly more distinct hives was bad news for red humanity.
It showed that the mutated voribugs were advancing as a civilization.
Perhaps ordinary people might view it as a sign of weakness on the part of the mysterious Devourer Queen, but the Dark Apostle and others knew better.
The introduction of a deeper and more organized hierarchy would allow for better management of the mutated voribugs.
By tasking the 'princesses' of these hives to pursue different strategies, the mutated voribugs could try out multiple approaches to warfare. This would allow them to rapidly learn what worked and what did not work for their particular race.
The more successful princesses might receive great favor and become the designated successors of the queen.
The less successful ones would either be replaced or be allowed to make a comeback in order to provide more competition for their more successful peers.