Good article here is a snippet of it. There definitely is some truth to this, if we want to get anywhere we have to get rid of these types of players:
It was April 10 when Walcott had the dubious honour of being captain for one of the most notorious 90 minutes in Arsenal's recent history: the 3-0 defeat to Crystal Palace, which had travelling fans funnelling their frustration at the team and manager from the stands at Selhurst Park. The fractious evening sent reverberations around the club. It was the low point of a season that was already limboing to its conclusion.
Walcott's issues that night were threefold. Firstly, on a small scale, he was the figurehead for the abject surrender. Secondly, he made the grievous error of going on television to admit that "Palace wanted it more than us." You might welcome such honesty if it spilled from the lips of Patrick Vieira, designed to spark some kind of reaction; from Walcott it just seemed pathetic, an insight into everything that was wrong with the team. Wenger was reportedly angry that his captain for the day had been so incautious in public, even if he had been honest.
Thirdly, and most significantly, the defeat inspired Wenger to make a tactical change that has made Walcott almost irrelevant.
Walcott's big problem with the 3-4-3 that was brought in to stem a flow of goals is that it leaves him with no natural home. The wide attackers in the three, usually Mesut Ozil and Alexis Sanchez, are effectively inside forwards and require more cunning than Walcott can provide. He has abandoned his attempts to become a central striker, so unless he can perform the kind of transformation that made Victor Moses one of the unlikely heroes of Chelsea's title win, and there is little evidence he would make an effective ersatz wing-back, it is hard to see what he offers his manager.