I don't think Dubas is a determining factor in any of this, as my theory is actually that Toronto based teams like the Leafs and Jays build towards more offense as a big ticket, entertainment dollar thing. You'll notice the Jays have had two builds in recent years with big home run hitters, the Leafs have been geared towards offense since the Kessel days. It's about winning but it's also about entertainment.
Defense seems more important for a smaller market team that's concentrating its limited budget on one part of the roster, and defense doesn't cost as much as scoring. You make a bigger splash with 3-4 elite defensemen who are on more affordable deals than trying to get 3-4 elite forwards. I guess the baseball analogy would be developing a lot of homegrown pitching, similar to what the Tampa Bay Rays have done over the years.
Completely off topic, anyway back to Liljegren.