You know that under your own criteria, only a handful of players have played at least a full season with Lefebvre, right ? If we're gonna blame Lefebvre for failing to teach, you have to use a sample where he actually taught more than a tryout. Here are the players falling under your criteria:
2012
Charles Hudon, 122OA : Just finished 3rd AHL season
2013
Michael McCarron, 25OA : two AHL seasons, several callups
Jacob De La Rose : three AHL seasons with callups
Sven Andrighetto : two full AHL seasons and two more with callups
Jeremy Gregoire, 176OA : just finished 2nd AHL season after a long CHL stay
2014
Nikita Scherbak, 26OA : Just finished second AHL season
Brett Lernout , 73OA : Just finished 2nd AHL season
Daniel Audette, 147 OA : Just finished first AHL season
It's an awfully small sample, but I have no reason to believe any of these players was significantly mishandled. Do you ?
Understand, I'm not saying Lefebvre is the pinnacle of AHL coaching. I'm just amused that you think he is ruining players.
I'm really pleased with McCarron's progress. Anything Hudon does will be a bonus. The rest I don't really care for but the jury is still out on many of them. Did you expect Lefevbre to turn Gregoire into Max Domi or something ?
The something wrong here is your question.