Who are the Africans playing on these teams? The rich Africans that can afford to not work and practice and join their version on the AAU teams? Or the everyday African?
The best Africans in every country. It doesn't matter if you are poor or rich. Soccer is a poor mans sport in the rest of the world. The African Cup of Nations is just like FIBA World Cup or the World Baseball Classic. Those tournaments are littered with players that grew up poor and had to work hard to make it to the where they are now.
You said that if Africans played the sport they would dominate. Well they do play the sport. It's the most popular sport there along with Rugby and Cricket. George Weah from Liberia in 1995 won both the Fifa Player of the year and the Ballon d'Or (Top player playing in Europe.) Weah grew up in a slum in Monrovia (Poorest city in the world.) He didn't have the AAU infrastructure backing him and would probably consider himself an "everyday African."