What does “al-sayyiʾ” contribute in “wa-lā yaḥīqu al-makru al-sayyiʾu illā bi-ahlihi”?

Musāwāt and Ījāz al-Qaṣr: Proportionate Wording and the Rhetoric of Qiṣāṣ

• It places the subject in the accusative
• It qualifies the plotting as evil
• It causes the beginning of the predicate to be omitted
• It cancels the restriction introduced by illā