Faṣl leaves two clauses uncoordinated, whereas waṣl may join them with wāw. Yet merely finding a wāw is not enough: one must ask whether it links independent clauses or constituents within a single construction.
In «جَاءَ زَيْدٌ وَعَمْرٌو», the conjunction joins participants in one predication. In «جَاءَ زَيْدٌ وَجَلَسَ عَمْرٌو», it joins distinct verbal predications. The rhetorical question concerns the relation between the two judgments, not every occurrence of wāw.
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Supplementary Practice 1: Applied Analysis of Faṣl, Waṣl, Ījāz and Iṭnāb
Faṣl leaves two clauses uncoordinated, whereas waṣl may join them with wāw. Yet merely finding a wāw is not enough: one must ask whether it links independent clauses or constituents within a single construction.
In «جَاءَ زَيْدٌ وَعَمْرٌو», the conjunction joins participants in one predication. In «جَاءَ زَيْدٌ وَجَلَسَ عَمْرٌو», it joins distinct verbal predications. The rhetorical question concerns the relation between the two judgments, not every occurrence of wāw.