A boy is 23 years old having his 1st proper season at Arsenal, he's far from being top class. It's just that he's been having a better season than all Walcott, Chamberlain and, mind you, Sanchez yet hasn't played as much as all of them. It really is almost like Wenger expected some of the above to hit the form and hence playing them ahead of Campbell but it hasn't worked at all.