In that position the danger is the ball going across the face of goal. Get to the near post, cut the angle down, don't let the ball go across the face of your goal. You don't need to be Baresi to know that's the position to take up.
Are you saying that Jones should have predicted that Baily will play him onside and Darmian wont offer any resistance against the cross ? The game was placed at a fast pace and he couldn't get back. Are you neglecting the fact that Baily just allowed the guy whatever his name is to run past him like he was not there and tap in the ball ? Baily was ahead of him too but still didn't sense the guy running behind him ?
First goal was all Baily. Second was all Jones . That's my opinion