I get that you're an expert bro. Your post count tells me everything I need to know.
In my dreams like you.
Don't get this wrong or as an offense to you. It's just that people here don't like Hiller because he sells bullshit information like the "leg press > squats" nonsense that everyone who has done this for a while knows it's a bunch of crap.
I would not claim to be an expert in jump training but I have made some pretty reasonable gains and everyone who did as well here will tell you that you need to squat,
especially if you are not very strong to begin with. Squats will build strength that is applicable to jumping (unlike the leg press, which basically does nothing) because it not only trains the legs, but the entire kinetic chain or what you would refer to as "the core" and provides a much better stimulus for the CNS as well.