Summary:

Most Europeans who have good magic for hockey stay in Europe. There are a few leagues that don't use magic over there, but most of them do. Russia is famous for it, and famously does shit in the international leagues that don't allow it, and phenomenally in the international leagues that allow it.

Rozanov's powers don't just guarantee him the win. The last Russian with solid Hockey powers who joined the MLH was Varkov, and while he never admitted why he made the switch, it seems obvious to Shane. He still doesn't understand why Rozanov would.