I know that CZ is very good in tgs, have I seen them win in AL and I assume their team performance will be way better than their 1v1 elo seeding. And I can see them winning versus USA, but USA is "only" 200 elo ahead not 400.Clearly you are very new to the scene.
CZ clan has been a fixture top 10 team for years in the Voobly days. Even though they didn't quite make the cut for the latest big events they are all very experienced team players with years of playing together under their belt.
Surely they are not favorites against Norway, but they are certainly not *less* favorites than some of the higher seeded teams that are just a combination of high 1v1 elos.
For instance, pretty sure CZ would beat USA handily despite the rating difference.