There certainly was nobody of that caliber before he came around (unless you count Erich Kühnhackl, who never really wanted to play NHL), but it isn't really true that no one comes close to him.
Tim Stützle has actually been tracking ahead of Draisaitl throughout their early careers, e.g. Stützle made it to 250 career points in 287 games while it took Draisaitl 305. He also should make it to 300 points before Draisaitl did. Afterwards it gets trickier, as this is around the time Draisaitl added another level.
Stützle does have a 90 point season at age 21 though, and he has also upped his offense again after he played with an injury for most of last season. He has also taken huge steps defensively. Even if he should fail to reach the heights Draisaitl has seen so far, he's still very much a franchise player in his own right, and does have the talent to grow even further.
The rest isn't quite at that level, but Seider is still a young high-end defenseman, and Peterka - even though he is in a slump right now - should be at the very least a 2nd line player, if not more, though obviously not franchise talent.
It's not that unusual for smaller nations to have a big star with little beyond that. Kopitar would be an obvious example, or Dirk Nowitzki in basketball.