There is only 1 out of 31 teams who wins the cup. So, most teams that do make big additions will not win the Stanley Cup. I have heard this argument from Burke about how the percentage isn't very high of a team winning after a player is added and I think that is a pretty lazy statistic.
Instead, I would like to measure the incremental benefits after adding a player. For example, does adding a rental boost a team from first round exit to second round exit? This is a lot more difficult to measure but is important. A second round exit means more excitement, sales, and additional playoff revenue that may offset the price of a rental (For instance, look at a team like a Columbus who desperately needs a series win in franchise history).
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