And leave a huge gap in the defence when they have the ball? It's not the way 3 at the back works
Then what's the extra man/men doing? Teams play with a front 3 mostly so wide players are covered by the wingbacks with 3 cbs left to look after 1 cf whilst the midfield gets over run? That doesn't make sense to me and clearly isn't working, surely the extra opposition players in midfield need to be covered somewhere in our defensive third. If the spare CB picks up the most advanced opposition CM/AM then that leaves 2 cms v 2 - there shouldn't be a huge gap left if one play pushes up anyway