There are two problems with acquiring Stamkos. The first is that players exit their prime scoring years right around age 27 so regardless of how well he's done in the past, he will not better the scoring output (or at least it's very unlikely that he will) that he had over the last five years in the next five.
That doesn't mean he won't be a better or more well-rounded player but he's not going to put up the points he once did if history is any indication. Ironically, Yzerman is a good example of this. Much better player in his late 20s and early 30s but not nearly as dynamic of a scorer.
The second thing is his contract. If he goes to free agency some team will offer him MAX by MAX ($14 mil by 8?) and I'm sure he knows this so if he's going to take less than that it'll probably be with Tampa and probably wouldn't be with Calgary.
If I'm Calgary, I don't really want to give up very good assets for a player who is awesome but will be taking up that much cap space. Would I pay him MAX by MAX as a free agent if I'm Calgary? You bet I would. But I don't give up assets for that contract knowing his best scoring years are behind him.
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