They couldn't cover Lamb because he was lining up all over the field inthe 2nd half. Outside, Slot, Twins with Pickens.. You name it. Very hard to cover when I have to keep Stingley on one side and Lassiter on the other side.
Lassiter already got burnt deep by Pickens when they went man coverage and they wasn't going to let that happen again so they put a safety over top to shade GP3 and played zone.
When they did cover Lamb, Flournoy, Ferg, and Javonte had 12 receptions combine as a result. It was pick your poison at that point.