I'm on board with Soucy even though my preferred target is Lauzon but if we're being honest are any of them really an 'upgrade' on Anderson, Bjornfot? Just more of the same with a little meanness, not top pairing guys by any means. But I guess definite Edler replacements over Wolanin/Maatta.
Chychrun is a surefire top pairing two-way dman of the perfect age to transition between Doughty and Clarke on the top pairing barring any other suprises.
I waver back and forth on Chychrun don't get me wrong but those are two completely different classes of player.
I'll give you profiles of three defensemen and you tell me which one is more valuable. (all stats at even strength over the past three seasons; rank amongst 242 defensemen > 600 minutes played in parentheses)
Player 1: 0.14 G/60 (164) 0.64 points/60 (187), 47.22 GF% (157)
Player 2: 0.45 G/60 (11), 1.09 P/60 (52), 45.04 GF% (188)
Player 3: 0.32 G/60 (32), 1.17 points/60 (33), 63.19 GF% (1)
Player 1 is your most non-descript NHL defenseman (Lauzon), Player 2 is your flashy 1st round pick (Chychrun), and Player 3 is the player that ends up on the plus side night-in, night-out (Soucy). Surprisingly, Soucy has more points per 60 minutes ES than Chychrun.
Now before you go and say that maybe Soucy gets more O zone starts, he doesn't. He's used as a defensive defenseman, yet puts up points like Chychrun.
Or you'll say that Chychrun plays on a bad team, so that's why his GF% is no good. Soucy has played on Minnesota for two seasons and now the Kraken, and each season he has lead the team in +/-. He is also the league leader in GF% Rel by a wide margin, which means the team is way better with him on the ice than not. Soucy also plays on a bad team now, but he manages a +8 while Chychrun is a remarkable -29 in 26 games. These are the stats that are particularly telling for defensemen, and it's plain to see that Soucy is a very, very good defenseman.
How does he do it? On the back of the league-leading PDO. Top 10 on-ice save % in the league, and leads the league in on-ice shooting %, meaning he's good defensively, and his team scores a lot when he's on the ice. As a stat-head, I would make the case that Carson Soucy is the most under-the-radar great defenseman in the league.
I'm not saying that Chychrun isn't awesome or wouldn't be a great add, but you have to pay 3-4 top prospects/1st-rounders to get him. Soucy won't cost you the farm and would be a great partner for Doughty or Brandt in the future. Value-wise, the better choice is Soucy.