It has been the way that every World Cup sees one West African team derailed either by infighting and egos (Cameroon in 1998, Nigeria in 2002) or squabbling about bonuses (Togo in 2006, Cameroon and Ghana in 2014)
I wouldn't be surprised if the habit of parachuting in some journeyman European coach once the team had qualified had something to do with it myself, as the players can adopt the attitude of "We qualified without you, who are you to tell us how to play?"
Nigeria had a Nigerian manager in 2002, Ghana have a Ghanian manager this year. Whether they have a native (or European) manager doesn't really come into it, although these countries should be looking more at developing native managers (coaches) as its more healthy in the long run to have a native in charge, yet they also need to prove they are capable.
