I never said immediately improved, I said quickly improved. And my point was not limited to the Leafs.
I sincerely think Nash requesting a trade out of Columbus was the best thing that ever happened to them, and if it's not then dodging the bullet on Bobrovsky and his $10 million contract was. CBJ has generally been one of the better teams in the East since they traded Nash.
And Boston trading away Jumbo set off a chain events that very quickly had them rise to have a sustained run of success as one of the best teams in the league (and one of the best decades of hockey in franchise history).
The Islanders record since losing JT speaks for itself.
The Hurricanes were kind off caught running in place in no man's land with Eric Staal and it seems trading him was the launching pad to get them back to the ECF and set up to be long term contender.
The Hurricanes also won the Stanley Cup with a 100-point Staal. Staal was on a downward spiral when Hurricanes traded him, so I don't think he's really that great of an example.