Where are you seeing results for this year? They aren't posted, so everything has to happen through the grapevine.
In U16, there are some clubs that can't keep up, but they get clobbered by everyone and age out by U17.
True, but there's also the SoCal bump. SoCal non-academy teams do much better nationally than their rankings suggest because the league is so strong and the kids are heavily recruited outside of SoCal. Interestingly, though, SoCal academy teams don't dominate on the national stage.
This is true of many of the teams now: Strikers, FCGS, LA Surf and others have rosters bigger than can dress for a given game.
Strikers to academy is a thing, sure, but so is Murrieta direct to the pros. Rarities like this (so-called black swans) are hard to predict. Also, the academies often aren't in SoCal.