Arguably, the 'concept' is the reverse of before.
The original academy seemed to go for a 'quantity over quality' approach - i.e. If we get one or two first teamers out of an intake of, say 20-30 per year, then that was deemed a success. Cortese on the other hand looks to be going for 'quality over quantity' - i.e. Success would be the vast majority of the "U21s" set up making the first team squad.