The long break Anaheim got from the sweep in the first round had them really fresh and hungry for playoff hockey. It ended with them bringing the game to the Flames and leaning on the Flames' defense quite a bit. Unfortunately that option is not there, so I chose the three defensemen option.
Also, I think a secondary reason was that the Flames were just coming of too much of a high, from winning the first round at home, against all odds, after yet another comeback. As a result, they thought(hoped?) it will be easier than it actually was.
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