That's a hard no from me. Couturier looks more like a keeper to me than some of the guys you list, honestly. I want him over Barzal, at least.
Getting Seguin is a good idea, but I'd look to move Barzal who doesn't hit or shoot much.
We don't know how many teams you have or how many you start at what positions. If you break out wingers, Seguin move up a notch, and the centers drop down.