وأسروا النجوى الذين ظلموا
Those who acted unjustly held their secret consultation.
The Qur’anic construction is discussed because it allows grammarians to examine how الذين ظلموا relates to the agent already expressed by the verb. One possible account involves substitution (badal), alongside other analyses.
This is not proof that any agent can be placed anywhere without grammatical conditions. Its value here is to demonstrate that a rhetorical argument must attend carefully to syntactic possibilities.