I am pretty sure to state that common sense dictates the most wealthiest clubs have resources and the aura to attract top end youth talent regardless of any area or region. Just look at Ajax, they're better at development than any club in Ligue 1 and they get all that youth talent is because they're known as the best team in the Netherlands. Citeh has some of the best youth players across Europe and that's because they can give high wages at a very early age. That's how Barca and Real Madrid always normally have either the best Spanish or Brasilian/South American prodigy in their youth ranks all the time (likewise with Bayern and German kids like Kimmich). Remember when that Korean kid was supposed to be the next Messi? Well, Barca bought him because he knew he would have a great chance to develop at Barcelona over any other club because kids know how big these clubs are. Lyon is just an exception to this rule, not the norm.