Leafs prospect William Nylander is dominating the AHL despite being young enough to pass for a high school senior.

There are compelling reasons to call him up to the NHL.

• The Leafs are bad and have scored the 6th fewest goals in the league.
• Nylander leads the AHL in scoring with 23 points in 17 games.
• It's his No. 1 goal and he doesn't seem to have trouble with goals.

But calling up Nylander isn't best for the Leafs long-term.

Why?