Not every wāw is a circumstantial wāw. A coordinative wāw joins comparable elements or assertions; a resumptive wāw begins a new discourse move; a circumstantial wāw links a concurrent state to the event under discussion.
In جَاءَ زَيْدٌ وَعَمْرٌو, wāw coordinates two grammatical subjects. In جَاءَ زَيْدٌ وَهُوَ مُسْرِعٌ, it introduces an attendant nominal clause. The correct procedure is to identify the predications and the syntactic position before assigning a rhetorical role to wāw.