There's all sorts of interconnected programs and partnerships etc.... that go on behind the scenes in youth football.
There's probably been some sort of investment/specific focus on Guidars in the last few years from the Malian FA to develop domestic talent, and so funneled the best youth players to them. It may even be in partnership with some European clubs (the Red Bull connection seems to suggest so).
The result is a bigger than usual group all coming through, or at the very least a group with more eyes on them from European scouts, with the Malian national team hopefully benefiting down the line.