And like I said, you weren't wrong, just splitting hairs because the careers of some of the names the other poster was obviously thinking about (Kwiatkowski, Murphy, Scalzo, Harrison) took them to the Swiss league slightly before/after those WCs. Surely the turnover between WC and Olympic rosters is evident to everyone.
The 4 players that carried over for Canada rode the pine for the most part (Duchene, Hamuis, Subban) or were replaced due to injury (Stamkos). Only 3 Americans carried over (Faulk, Oshie, Stastny). Then there's the gap:
9 Swedes carried over (Enroth, Gustafsson, Edler, Kronwall, Tallinder, Ericsson, Eriksson, Landeskog, Sedin). 9 Finns carried over (Hietanen, Kukkonen, Lepisto, Vaananen, Aaltonen, Granlund, Kontiola, Korpikoski, Salminen). And I think 12 Russians carried over (Varly, Belov, Medvedev, Nikulin, Tyutin, Anisimov, Kovalchuk, Ovechkin, Popov, Radulov, Svitov, Tereshenko), which is why they were considered dangerous on home ice. You can judge how much impact those groups had relative to each other in the Olympics for yourself.
The WCs teams are typically barely able to be considered B or C teams when it comes to Canada/US, and if chemistry is as important as we're supposed to believe, you can see who was expected to have any kind of "not just on paper" advantage this year, too.