It's just semantics, when people talk about 3 at the back or 5 at the back they're generally talking about the same thing, 3 CBs and 2 WBs
But having EMC on makes sense now we've got an extra man and that would mean going to a 4.
He started the move that lead to Wrights chance with a short ball in a tight area when it might have been easier just to stick his boot through it given his fuck up seconds earlier