With this trade, the Toronto Maple Leafs would be giving up one of their better playmakers to bring in more goal-scoring in the form of Cole Caufield. While Cole Caufield is a good young player he has yet to hit the 30-goal plateau.
If change is all that the Toronto Maple Leafs want a trade to just move off of Mitch Marner could make sense in this case. However, unless the opinion of Mitch Marner has really soured around the league they can likely acquire more than this.