It all comes down to Charnley, he's been promoted to a position that he's completely unsuited to and probably lacks the confidence to sack someone. Anyone who gets in front of him with a bit of bluster and confidence will make him panic and do whatever they want (probably make him piss himself too).
Plus, judging by his performance so far he's probably forgotten to employ his own replacement and just sits alone in his office all day wondering why no one is answering the phones.
Yeah but this is a ploy by Ashley, someone he can bully and won't cause any waves....ie won't run the club properly.