How is Group A the toughest group?
Maybe for Slovenia/Slovakia, but for the U.S. it's basically 2 wins and a close game.
If we were in B, we'd be playing the Fins and Canada.
In C, Sweden and the Czechs.
you can't really look at it like you're moving to another division with no other repurcussions otherwise one could say your group is the toughest, move Canada to that group and they'd be playing the USA and Russia instead of Finland, and...?
if you compare USA's schedule to Canada's...
Russia > Finland
Slovakia > Norway(despite how awful Slovakia is playing)
Austria > Slovenia(maybe, Slovenia is playing awesome though)
USA's is clearly tougher. comparing yours to Sweden's...
Russia > Czechs
Slovakia = Swiss(Slovakia should be better than they're playing, it's pretty close usually)
Latvia > Slovenia
Pretty close, but normally best on best the USA and Sweden beat all those teams the majority of the time besides Russia where it's tight.
So I would say the USA would have a tougher time going 3-0 than Sweden would, and they did.
That doesn't mean they deserve to be ranked ahead of Sweden though, ranking has to be objective, and Sweden did win all 3 games in regulation, ranking 2 teams with completely different schedules isn't exactly fair but that's how it works unfortunately.