He never played in any other tournament, so I don't understand the point.
Why did he only play one tournament? Injuries? Considered not good enough? Attitude problems?
I'm partly being a bit intentionally silly, sort of attempting to immitate the way I think some/many here look at non-NHL play. It is often used as an argument against European players that they "didn't prove themselves enough against the best players". For example, some used that argument against Makarov (who did excel on three Canada Cups and also "proved himself" during other similar games, while also winning 9(!) soviet scoring titles and some during World Championships, where he also was a regular All Star, etc...). Using the same logik, Roy is rather "unproven" internationally. For example, he never excelled on European sized rinks. In my opinion, Europeans often have "proved themselves" more than North Americans, but it is often used against them that they don't have as good NHL longevity or NHL prime/peak as the players they're being compared to.
(The above is a general reply, not directed to you.)
Partly off-topic:
Imagine the NHL of the 1980s also having the 7 best Soviet teams, totalling 28 teams. The Soviet teams will play half their games on home ice, with large rink size. Imagine how a team like CSKA would dominate, and how their star players would end up high in basically all statistical categories. We also know that there were teams of non-CSKA players, who used to defeat NHL team when playing against them (usually away), and who had first line players that likely would have ended up high in the NHL scoring.
That would have been fair.
But most people here basically just look at the NHL as it was and seems to automatically assume that basically all the best players played there. They didn't. The guys finishing 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 in the NHL scoring, might have ended up 1, 3, 4, 6, 9, 10, 12, 13, 15, 17, if the best Soviets had played there on the same terms.
Back in the 1970s and 1980s, Soviet was probably more competitive vs Canada than they are now. Today we see guys like Malkin, Datsyuk, and peaking Ovechkin "proving" they are as good as the best Canadians. Why wouldn't the 1970s and 1980s Soviets have done it, if putting the best Soviet teams in the NHL and let them play half their games at home?
The forum is quite unbalanced when comparing North Americans to Europeans, not realizing it was harder back in the 1990s for young Russians to "prove themselves" early on in the NHL than it is today. North American players get used at a young age to play in North America. European players oftens first stay a year or two longer in Europe (where good hockey is being played too!), and also might take another year or so to adapt to NHL play. As goes for the 1980s stars, most of the best Soviet players of the 1980s were also past their prime when entering the NHL, making it even harder to adapt. Despite that, the North American players often are looked upon as "excelling earlier", while Europeans needing more time, without giving enough respect to the context.