Again, it's ONE team. Your expectations seem a tad outta whack. I'm sure some prominent junior teams like the London Knights or some Q teams have produced some future stars at a semi-regular clip but that can't be the case with every single one. There's tons of them, and landing a big star takes as much dumb luck and, well, good connections as anything else. The fact that they took some unheralded players and developed them into worthwhile NHL players is notable in and of itself. Do they need to spit out a Connor McDavid or two?
This is like saying "Yeah, DU has won a few national titles, but man, they've only produced guys like Matt Carle and Tyler Bozak."