I was in Tallinn a couple years ago and asked one of my co-workers why hockey wasn't as popular in Estonia as they're surrounding by two elite and one well-known hockey country (Finland, Russia, Latvia). He said that Estonians tend to be more interested in individual sports like weightlifting, track and field, etc. and that many of them view hockey as a "Russian sport" and thus aren't very interested in it.
Apparently they have a really good young skier (Kelly Sildaru) which is a bit weird because I don't think they have any mountains. Only 16 years old she was favourite to win gold at the last Winter Olympics but had to pull out due to injury. I think the only other Estonian athletes I can remember hearing of is some guy in weightlifting competitions and the occasional track and field athlete (I vaguely remember some twin girls that were runners or something many years ago) so that guy's take checks out.
I think the biggest sport popularity wise in Estonia is probably still cross-country skiing? Or at least it's up there. They've had some real big names there, both male and female, such as Andrus Veerpalu and Kristina Smigun, and they also had a guy who won Vasaloppet once, Raul Olle. And from one type of skiing to another type of skiing, perhaps the leap isn't too far? You can always train abroad these days.
But yes, other more individual sports such as track & field and road race cycling are also popular.
But regarding cross-country skiing, I've been told by an Estonian person who is extremely uninterested in sports that when Andrus Veerpalu got caught doping (like a lot of people in skiing and other endurance sports) apparently it was almost like a national trauma or something and he was crying on TV and all that. Much like the Mika Myllylä thing in Finland.
The city where Leo Komarov was born is about 94% Russian, and is right on the Russian border. Someone up thread claimed Komarov can speak Estonian, but I wonder if he can source that claim. Wikipedia says he speaks Swedish, Finnish, Russian and English fluently. For a native Russian speaker moving from Narva at 5 years of age to the Swedish speaking part of Finland, also speaking Estonian seems like a bit of a long shot to me.
It's probably that he (Komarov) can understand it fairly well (Estonian language) and speak it to some degree, but that he's not fluent in it.
It reminds me of that claim that Zdeno Chara can speak 7 languages of which one is Swedish. Though when they interviewed Chara on Swedish TV during his lockout stint with Färjestad in 2004–05 they interviewed him in English. Curious to me to interview someone to a Swedish audience in English when the guy speaks fluent Swedish, unless it's just a fluff claim and he speaks it very very badly.