Exceptional Latino boys generally grew up watching a lot of soccer, playing with their friends, cousins, uncles, dads. They've been touching the ball since maybe diapers. Non-Latino boys who play club generally were exceptional AYSO players, whose dads got convinced by someone at some point to go club. Dad doesn't know soccer, or perhaps played a perverted form of soccer years ago, so no clue as to what the sport requires in terms of development at stages.
Unfortunately, Latino dads often seem to know little about nutrition, and the fact that rest is development. Exceptional Latino players generally play way too many games, where the need to win is so strong they play through pain and compromise technique. These repeated micro injuries combined with poor nutrition are poisoning these boys. Perhaps that's why it may seem like the non-latinos are "catching up."