Now I am no GK coach but to my eyes, all the keepers under Conway's watch got worse at distribution and box command. These happen to be things that Conway himself was poor at when he played and pretty much all MLS GKs were poor at in that era of MLS. Now the shot stopping was fine but I assume that's probably Conway's priority in training, much like it was in his playing days.
Now is it a smart move to expect a keeper who was poor at distribution (and probably poorly trained at it too) to teach and drill distribution and bring about improvements? Not sure but in any other specialized training job a manager would never appoint someone to do that role with his CV or keep them after it's been shown to not be working.