Why is it offensive to say that Luke won’t be as good as Quinn? That’s not saying that Luke won’t be a good player.
Quinn played on a pretty poor Michigan team, whereas Luke played on a powerhouse, which might inflate/deflate one’s point totals.
Stats aside, I think what drives Quinn’s game is his hockey IQ. He thinks and sees the ice at an elite level, which is why he’s an elite defenseman, even at his size.
What drives Luke’s game is his skating and his shot. Luke is a better straight line skater than Quinn, whereas Quinn’s edge work is what makes him such a good skater. Quinn will never have the shot that Luke has.
Defensively, Luke will need to develop substantially to make good on his potential as a 6’2 framed defender with elite skating. But if he is anywhere as competitive as his brothers, he’ll round out his game in the next few years. That’s an advantage a smaller player like Quinn will never have.
There’s no real need to compare the two, because they are different people and players. Both players can be great without stepping on the other.