Quoting: TommyBPickles
I don't follow your logic, If you are arguing that Liljegren could be Parayko, why is it not valid to argue that Kyrou could be a nylander? Both look like really good young guys who have done nothing yet. Also I would argue that Parayko holds more value than Nylander, A good D holds more value than a good winger. Add in that his contract is way better value than what nylander is supposedly asking.
Nylander is 22 and has 2 full seasons of NHL experience under his belt scoring back to back 61 point seasons. In comparison, Kyrou is 20 years old and hasn't made the lineup yet. Could Kyrou become a 61 point player? Sure. Nylander however is already that and his best hockey is still in front of him. He's a star, not a 2nd round pick prospect.
Parayko is a very good defenceman, but he is 25 the middle of his prime. He still has a lot of hockey ahead of him but he's not likely to develop much more than he already has. Liljegren is an unknown but he's 19, an incredible skater and has a very high ceiling.
That alone is enough to make me not really want this trade.
From St Louis's perspective, their defence isn't as amazing as it used to be. Peitrangelo is a Norris calibre defenceman, no doubt. Parayko could be a top pairing guy on a lot of teams, no doubt. But after that, they aren't exactly loaded with high end defenceman. Their forwards are on the older side and their "window" of contention isn't exactly big. (I am not sold on them being anything more than a bubble team) so trading their 2nd best defenseman for a guy who won't likely be ready for a full season or two, seems like a terrible idea.