Roussel has had injury issues but is a legitimately good third liner.

Tryamkin: To me is is trade bait. A #6 guy but just large. He wasn't all that great. I could see him being used to move a bad contract, otherwise not worth much.
Gaudette: He carries quite significant value. Nothing VGK has is really convincing enough to make a move though. If he were to ever be moved, it would be for an equivalent defenseman. I'm thinking DeAngelo-Cernak etc range of value.
Roussel: He has been pretty bad this year since his return from injury. I would let him off for a mid round pick just for cap freedom. Ferland when healthy is better. Roussel still is a top end fourth liner and OK third liner.
Woo: He still holds his value. I think he is also used for trade bait in either future TDLs or to force seattle to pick one player over another.

Deangelo is for sure worth more

I listed a range (ex: he is between the values of those two). Cernak is probably the lower end and Deangelo the higher. Rangers need for centers might have them value Gaudette more. Gaudette could become a 2C on the rangers. Canucks add in a value perspective though, where TB adds for cernak.

They, along with most others probably value chytil higher as the future 2C, and karl henriksson who isn't known to many outside the rangers fanbase has tons of potential