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Part of the reason why the Leafs allow so many goals is because they don't have enough top-tier talent on the blue line. Goaltending isn't the only issue.
Dion Phaneuf is a top-two defenseman who plays well at both ends of the ice, but a team cannot win a Stanley Cup when Phaneuf and a 22-year-old player in Jake Gardiner are its two best defensemen.
The Leafs' defensive corps is one of the weakest in the league, and teams cannot win in the playoffs unless they defend well. We saw in last year's playoffs how crucial defense is to winning in May and June.
The problem for Nonis is that there aren't any franchise-type defensemen eligible for unrestricted free agency this summer, unless you consider Vancouver Canucks star Alexander Edler this type of star, but he's not a defensive-minded player.
However, there are a few restricted free-agent defensemen in the 2013 class that Toronto must be willing to extend an offer sheet to, and that list includes Alex Pietrangelo, Kevin Shattenkirk, Oliver Ekman-Larsson and Zach Bogosian.
Ekman-Larsson, in particular, is one player the Leafs should pursue because the Phoenix Coyotes are one of the most financially troubled franchises in the league. According to Forbes, the Coyotes lost over $20 million during the 2011-12 season.
Burke doesn't like offer sheets and chose not to use this method to sign free agents during his tenure in Toronto, but for the Leafs to be successful long term, they have to use all the options available to them when improving their roster.
It's not easy to acquire a No. 1 or 2 defenseman through trades, and if Morgan Rielly and/or Jake Gardiner don't become this type of player, then offer sheets may be the best way to acquire a top blueliner.
Nicholas Goss is an NHL Columnist at Bleacher Report, follow him on Twitter.