She arranged it this way because even though they all were Awakeners and members of the Devil Sect, the two groups came from different ethnic backgrounds with completely different customs and ideas, resulting in constant friction.
Currently, this friction is still manageable, but upon arriving at a new place, it's unclear whether the conflicts might escalate.
Furthermore, the 100 Awakeners all came from the slums of Qingshan City and have relationships with the 2000 ordinary Believers. If they were asked to abandon these 2000 Believers, they might be unable to accept it emotionally.
On the contrary, leaving them to live among the 2000 Believers allows them to manage easily due to their existing relationships with the Believers. That's why Zhixi divided them this way.
As for other details, there are many. But since Sima Liu didn't ask, Zhixi also spared the words...
