Hathaway would be my guess. I can't imagine an unsung defenseman (Kanzig or Sieloff) cracking this team ... there's just too much positional depth.
Depending on injuries, it will probably also be tougher for an unexpected role forward to crack the Flames roster this year than it was last year, a la Jooris. The probable full-time additions of Jooris, Shore, Bennett and Ferland to the starting line-up in the past 12 months might even make it tough for Granlund to stick in Calgary out of training camp this season, let alone Hathaway, Elson, Carroll, Van Brabant, or Grant.
I could see Hathaway getting a chance later in the season. All I've heard is that he's a prototypical Hartley guy: he's intense and energetic, skates well, and thrives within the Flames system. He may not have much upside, but he shouldn't hurt you at the NHL level playing within a specific role.
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