I can see trouble brewing in the future that is impacting today's rate of pay for Willy.
Willy wants $10.5 mil per and Leafs want him at $8.5 mil price point.
Reason player usage.
What is going to happen to Nylander's production when Tyler Bertuzzi joins Matthews, Marner and Tavares with either Rielly/Klingberg on PP#1 and Nylander is forced off it and onto PP#2?
Willy's points production will drop and Bertuzzi with rise.. Then when WIlly in making $8.5 mil the Leafs can also re-sign Bertuzzi for $7.5 mil when both similar 30 goals and 70ish point players, using the $2 mil saved on Nylander deal now to afford the Bertuzzi raise next year, and be able to keep both players at $16 mil combined as opposed to Willy at $10.5 and letting TB walk as UFA because you can't afford him.
Good Cap management requires long-term planning not just year to year resets, whereas oversp[ending in 1 year has a domino effect on future years .. When players leave some money on the table it allows for a better surrounding cast.