Rarely turns out that way, imagine if it were the 2004 draft and holding a top 2 pick but passing on a couple of "risky Russians" at the top of the Draft for *rest of draft*
I'm not saying the hypothetical "take a guy just as good" thing doesn't make sense in theory, but I just think in reality, you have to trust the opinions of your scouts and if they think someone is better, take him and don't look back.
I also think the way your state the percentages is not right. Only a 75-80 % to maybe play in the NHL in 3, 4, 5 years seems to imply there's a 20-25 % chance he just flat out never comes to North America. Only very few numbers of fringe players (Artur Kayumov level) that would be battling it out to be a 13th forward type just flat out "never come". There's some risk that you'll have to wait a while but they all give it at least a go of it and if they're special enough talents, they're not going back.