it's different though Stu, because Miccoli and Di Vaio could well have done better than DP, yet DP started all the time despite not producing the goods.
You might say that Zlatan is producing only because he's playing a lot, but that's like saying "Michael Jordan is only good because he practises a lot". In other words, I don't really care why Zlatan is producing, because the important thing is that he's getting results.
On the other hand, is there any guarantee that Del Piero would bring out the goods if he were played more often? IMO there's no guarantee, so the safest thing to do is to field the player who's producing i.e. Zlatan. As soon as Zlatan goes through a slump and Del Piero outshines him, then we should obviously bench Z and make DP a starter, but only until that happens...