Sticks in the craw but Liverpool model since Klopp.
Established stars in other half-decent leagues -
Established stars in smaller teams - mane, VVD, Robertson
All under a certain age, all identified (through data) as having key attributes for the specific system (insane physical gifts, pressing, pace, goals...)
They weren't exactly unknown gambles when they bought them[One of them being the most expensive defender in the world], and they were able to offer them a lot more than we currently are.