I think that comment, is more about the other players mentality at key moments. When you play friendlies you can take a bit more of a risk, but when the pressure is on, the choice is less easy. If its last minute of the game and they see Saha and Beckford open, Beckford in a better position, several players would instinctively choose Saha on experience. Its not something you can neccessarily just change, you need to have belief to trust him when the heat is on. Also if you can put an awkward ball in for him, you might wait rather than take the chance. All those little decisions can make huge differences and Beckford will have to earn that faith like everyone else.
It will only happen with time and Beckford doing the business when he gets those chances. But I have felt from the start of the season, that if he gets given that trust and the chance, he will put it in the back of the net more than most.