The Ottawa Senators are likely going to move the pending unrestricted free-agent, and unless there is a last minute deal that no longer seems possible, it’s just a matter of when. If the potentially best defenseman in the NHL is available, it makes sense that the Toronto Maple Leafs would be interested. Karlsson is a right handed defenseman, the exact thing the Leafs are looking for.
The Leafs have one of the best rosters in the NHL, they’ve got a near perfect mixture of players in their primes and young players approaching their peaks. Also, they’ve got some cap space and depth in the AHL, and most positions in the NHL.