I was in Beijing last year (12 timezones away). The jetlag os brutal.
1 timezone = 1 day of recovery. I'd be surprised if Yak and Nuge were at 100% when the season starts.
I don't see it being a problem. Professional hockey players are very good at adjusting their time schedules (although, admittedly it's usually not as big of a change as from europe), and if you do lots of travelling, jetlag is a much smaller problem than for the average folk. Considering there is still like 11 days until the season starts, they should be fine. Might be a tad off for the first day or so of camp, but that's it.