Do you really think that, I thought that Percy played better than Rielly during his all too brief period with the Leafs last year yet he was returned to the AHL while Rielly, a far from developed player, continued to play for TO.
Players who graduate from the AHL are totally ready to play in the NHL without further development, I disagree I think that development is ongoing and both leagues develop players.
Rielly was kept as a Leaf because of his potential but not because he was the more developed/finished product, TO is in the process of developing him.