It was usually the second ball that killed teams when he was doing it for us, as you say, and teams who stopped him successfully usually almost gave him the first ball and had that the second ball covered. We haven't got anyone who can live with him in the air, so that makes the most sense.
You can't just let him bring it down because he does it in such a high area of the pitch.
I think what some teams did really well against him was to have 2 on him, he finds it difficult to bring those balls down and as people have said his heading isn't perfect. I remember one game joe Allen made sure every ball that went up to him he was on his toes, Allen isn't huge and never going to win the header but he made sure he was there to make it difficult to bring a ball down and if he did to snap at his heels quickly so he can't release a pass. We know he can get frustrated and for me that was the most successful way to stop him doing what he can do.
You can't just let him have a one on one long ball to a chest because he is too good at it. Chelsea had the right idea, I'm sure Barry will try it for us but if we let him roam onto stones or jags without protection you are asking for trouble.
On a side note I hope he gets a good reception but in sceptical. A really good player for us, good service, made a profit on him and he gave us some great moments and some of the best performances I've seen from any of our players. Sadly doesn't always work like that, we couldn't blame him for going there but because of how it all happened with moyes' comments I fear he will be lumbered in with that.