I think what we'd like to see is our best five ball prospects (MVP+) prepared for the full NT from day one, and if they play for the U21s along the way, great. That leaves the four ball potential or less players (Superstar, Peren allstar, maybe even allstar in some positions) to be trained with only the U21s in mind - as they will then likely be sold at 22.
We want good communication with managers of these prospects, so they train the players well.
We want good communication with the community, so we know which players are coming through and become excited about seeing them play for the U21s.
Some success on the court would also be good, but not at the expense of player development.
Essentially it's about taking each draft group to U21 graduation and preparing the five ball potential players to be NT starters around the age of 24.
Eminence ticked all these boxes, and we'd hope to get someone just as good this time. Maybe even better, if we're lucky.