But those were tactics, can't criticise a fullback for playing high up the pitch when that is what they are instructed to do. Fat Sam went with 3 at the back. (BTW not defending Yedlin as i think he is a bit shit).
As for our fullbacks I think they are positionally great, again playing the roll their manager wants from them. When defending we are compact and keep our shape, very few teams pass through us, we no longer dive in and commit ourselves. In order to "open up" a game we have to take risks and push our fullbacks up the pitch, during a game there will be moments where this space behind them will be targeted by the oppo, at the moment that risk is paying off. My only gripe I have with our fullbacks and the supporting Midfield is not blocking crosses, they do allow a fair few to come into our box and I think the only vulnerability our CB's have shown has been in the air (Toby being better than Jan in the air), block the cross at it's source and we have almost the perfect defence.