no team is going to stop crosses coming into the box ben thats like saying you should stop all shots at your goal, it`s just totally unrealistic.
what you try to do is stop teams from getting in behind you and pulling it back from the byline but you`ve got no chance of stopping balls coming into your box if they are launched from a deepish position on the flanks.
anyway in the modern game fullbacks are attacking players and there are going to be times when they cant be in two places at once.
if you have center halves who can do the basics well (i.e head the f##king thing!!) then most of the threat is nuetralised.
the good thing is that we seem to be looking at the right type of player (like that papadopolous fella)