Usually, you hire a DOC and then that DOC hires coaches and/or trains those coaches to build teams to play the DOCs preferred style of play.
What LAFC did is hire a coach in Cascio, before they hired the DOC. I'm guessing LAFC didn't hire a DOC first because they only had one team.
Since they are planning to have more teams next year (at least 2) and their press releases say they will have full academy teams by 2018, I'm guessing LAFC decided it was time to hire the DOC.
It's never easy to be running the show, and then all of a sudden have a boss (the new DOC) who didn't hire you and has no ties to you, looking over your shoulder.
I bet Cascio and the new DOC didn't see eye to eye. Maybe the new DOC didn't like the style of play the team exhibited under Cascio, maybe the two didn't get along, maybe the DOC thought the team wasn't improving fast enough under Cascio, or maybe the new DOC just wanted to bring in his guy.
It's really a backasswards way of doing things, hiring a coach and building a team, then hiring a DOC who may not like the coach or team and blow them both up and start over, but it saved LAFC a lot of money.
And that's probably LAFC's main goal with their academy at this point, just keep the costs down. I would not be surprised to see the new DOC making a lot of changes in coaches and players going forward.