You don't add speed unless the skating mechanic is truly terrible. You can improve technique and strength to his legs but overall it's not an easy fix. I think the most important is learning on how to use his skating to his advantage and work on his gap control. I still believe he is too smart to not improve his positioning when facing faster player with a player like him the most important his limiting the impact of his flaws and let him uses his strength to his advantage, that will take time, reps and a lot video coaching. He is ready for the NHL, he needs to compete against the best to improve that part of his game.