After the first practice of training camp, head coach Craig Berube discussed his opening line combinations, Matias Maccelli starting on Auston Matthews’ line in Max Domi’s absence, Bobby McMann’s fit on the Tavares-Nylander line, and more. Training Camp Lines – Day 1 Lines at first practice of...
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This is why I don't think it's likely we see the Domi/Robertson/Cowan/Maccelli type guys on the Tavares LW; it's a waste to make Nylander the primary forechecker (which he can do pretty good) when he is the team's best F3 with his puck handling, distribution, and shooting abilities.
The Leafs, in the latter chunk of Keefe's tenure and for Berube's start, play a 2-3 OZ structure. The high forward helps the D stifle counter rush attempts, and also gives them attack options when the mess-makers down low dig out pucks and get open.
This is why I think the Leafs are really looking for forechecky RWs to unlock their plethora of zippy leftshot distributors. In the meantime, most of them will play off-wing to complement their glut of forechecky LWs.