I almost mentioned Gourde too, since they need scoring. His contract is only for less than 2 seasons though, and how much do we want to give up for that.
And he's such a tempo setter for the Kraken. Irie can probably speak even more to it than I, but in watching them, as he goes, so goes their forwards. He's back to being the honey badger he was when he first came up in Tampa - just all over pucks.
The other thought is that they need to sit down with someone they already have in house to try to mold into a possession monster who is defensively responsible. Kozak seems more like a high-end 4th line type (one who could be a PK guy and also do the d-zone start thing with regularity) but I don't know if he's one who can play further up the lineup. I'm losing patience with Krebs turning into that sort of player, though again, is that coaching?
Acciari is purely a 4th line type but maybe see if Eller is available as the Pens slide out of contention? Again, just random spitballing without having eaten breakfast and on my second cup of coffee, so this is entering my brain dead territory.