«الواو للجمع المطلق»
Waaw denotes unrestricted conjunction.
In “جاء زيد وعمرو” both people are said to have come. The particle itself does not say who came first. The arrivals might have been simultaneous or separated in time; neither order follows solely from waaw.
Conjunction means that both elements share in the predicate. Chronological order is a different proposition requiring its own indicator. Reading waaw as though it inherently meant faa or thumma adds a limitation that the particle does not establish.