United have a great track record for throwing young players into The Premier League. It's not about 'can't perform if he's not being picked', it's about performing day-in, day-out on the training ground. Zaha CLEARLY hasn't been doing this, otherwise he would surely have been involved a bit...
Is it true that Palace have the biggest squad in EUROPE, based on all the major top leagues?
If that is the case, then I reckon that you would want sell a few