McDavid is maybe not the right comparison. However, Dahlin is commonly compared to Nicklas Lidstrom.
I agree with the Anaheim fans that wouldn't trade Hampus Lindholm for the #1 pick. As good as Dahlin could be, its still all speculation.
I am surprised, however, that there appears to be a "lack of hype" surrounding Dahlin by so many. It gives credence to the notion that "if Dahlin was Canadian he would be hyped to McDavid level". As a Sabres fan I am trying to keep some of my emotions in check. Of course I want to believe he is Bobby Orr re-incarnated, but people have failed to live up to expectations before. But, what if Dahlin truly is the next Lidstrom or better? I'm hearing a lot of "he's better than Erik Karlsson at the same age".
It should not change your decision, but it its not just Sabres fans trying to pump up "their guy". Dahlin is legitimately a prospect that could be in the same conversation as Eichel, Matthews or maybe even McDavid.
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In regards to Rasmus RISTOLAINEN, he is still only 23 years old. Two things he has on Lindholm are points and RHD. If he ever has the chance to play on a decent team and figure out his defensive game (having a coach longer than 2 years might help), than he could certainly compete with Lindholm for a position on the top Dmen list. Again, not saying he's better than Lindholm or could get him in a trade, but he should get a hell of a return in the Sabres were stupid enough to get rid of him. They spent all of this time to develop him, they shouldn't cast him away before they can benefit from it.