There seems to be a disagreement about goalkeepers decision making.
Crosses or free kicks into the box should be done to cause as much confusion as they can with the keeper. That as they say is the job of the crosser/free kick taker. (set pieces)
No one should under estimate the difficulty of the decision making process for the keepers at this time.
In the premier league you will have your blockers that will be there to cause as much mayhem as is possible, just to get into his way. To stop him coming out to gather the ball or at least, to make it as difficult as they can.
A confident goalkeeper will let the opposition do all the worrying. He will not do the same thing all the time, he should be aware of where his own players will be in the event that he can gather for a quick counter.
When the ball enters the box his decision making reduces to micro seconds. To gather, to punch or to stay. A good goalkeeper will decide immediately where that ball is likely to land in clean flight. The six-yard box is his domain, anything in there is his, or should be. Whether it is to gather or to punch. Anything out side of the six yard box and in particular between the penalty spot and his box is the real danger area. The likelihood of a clean gather reduces tremendously at this point the punch is usually the most effective. Kelvin in particular was poor on these.
If a keeper decides it is going to be his ball in any of these area's then he has to make it his come hell or high water. No excuses, that is why so many stay on the line when outside the box, it is usually the better option in the long run. Trouble is if they always stay then the opposition will know this, so this is why a goalkeeper has to vary his tactics and is the cause of the mistakes. If you are weak on crosses your opponents will be aware and will play to your weaknesses.