I'd say the vast majority of players in general are not huge successes... regardless of development path. I'd take a 3/10 shot any day compared to what normal success rates are. Many players of all nationalities simply fail when getting to the NHL stage. The evidence is pretty clear here though, if you're not a top 6 scorer in the NHL, AHL time is pretty much necessary to stick in the NHL in a bottom 6 role. This goes for American, Canadian, Czech, Swedish, etc too... they all tend to need some time. It is not super common (though it does happen) where a bottom 6 guy sticks in the NHL right away and just stays there.
Which if Russians are not willing to go through that practice (and I totally understand why), they are simply less likely to stick in these lower roles. The data shows that very clearly... we basically have one guy over the past 8-10 years who skipped and stuck in a bottom 6 role. Prior to Mikheyev, Kulemin is the last guy I recall jumping right in from Russian and establishing as a pure bottom 6 guy without AHL time (though he had one career year). I could consider Burmistrov a 2nd, though that's just a whole odd situation there. I think this plays a significant role in why Russia produces less NHL forwards when compared to Sweden and about the same as Finland.
I do think coaching, style of play, culture, etc all play a large role in it and the guys who go CHL/NA route do tend to have an advantage of sticking lower in the lineup. They are just far more used to how the game is played in NA and what is being asked of them.
I'm not saying the AHL route is perfect or that any player really likes it.... just that for bottom 6 players, it does tend to be a prerequisite. If a player is not a top 6 sort of prospect, an unwillingness to play in the AHL raises the bust potential dramatically. If Voronkov doesn't stick right away and doesn't have a willingness to grid it out in the AHL, I have doubts he'll make it and I quite like him as a prospect.
Legit forgot about Kravstov's AHL games.