It's amazing how entitled some of the management defenders are when it comes to prospects.
Is a player a bad skater? Skating is genetic, so he's guaranteed a bust.
Does a player have a thin skin? Grit is genetic, so he's guaranteed to bust.
Does a player lack hockey IQ? IQ is genetic, so he's guaranteed to bust.
Does a player lack a strong shot? Wrist strength is genetic, so he's guaranteed to bust?
And on and on.
Aside from the fact that the above is a pseudoscience, it's also bad management practice. Within both the real world, and in the artificial world of the NHL and its enforced parity, you cannot have a full roster of perfect employees. That's because there are very few perfect employees. A competent employer has to work with what he has. If a particular employee is lacking a particular attribute, you can adjust the system to emphasize his strength, or you can help that employee reduce his shortcoming.
The issue here, is that the management defenders love Bergevin so much that they believe that he shouldn't have to work. All of the players need to be perfect in every attribute, and if they're not, there's nothing that the coaching and development staff can do to help them, as all skills are innate, though it's not Bergevin's fault for either drafting them or failing to trade them earlier.
What Leblanc had was hand eye coordination, hockey IQ, two-way play. He would have needed help to better develop strength, and apparently, grit. He would have also needed ice time. It's not a ridiculous order for a development staff.