If I'm looking at Boston, I'd target
Kastelic. He's 25, they just extended him at $1.57 mil for three years, He's physical, good in the dot, and used heavily defensively. Down side... hasn't played the PK much. This would be a Kampf replacement, not a 3C. I also doubt Boston moves him given his age, extension and they aren't out of this enough to become sellers yet.
I like
Krebs out of Buffalo. They don't seem to be able to develop anyone, he has draft pedigree and seemed to have more potential. He's decent in the dot, cheap contract, about to be RFA so control, and has some grit to his game. He is being used very heavily in the Dzone, and isn't getting killed with such minutes on a terrible team. I think there is more there, maybe a reclamation project for the Pro scouts to look at. I might be wrong, but the cap hit is good, the acquisition cost might not be huge, and would allow us to maybe go out and get a quality RD. $1.45 mil x 2 years, then RFA.
NYI... this list talks about Nelson.. but I'd be looking at
Pageau instead. More physical, better defensively, and good enough offense for a 3C. $5 mil contract... retained and it's excellent value.
Noah Cates is a name people have bounced around some too. He's young, proving he can play C well enough, is being used defensively a lot, but with very good results. He can PK. $2.625 RFA at the end of the year.
I've always liked
McBain, but Utah loves him, and I doubt they move him. They are playing him at wing this year, and frankly given he is playing with Cooley and Guenther his production hasn't been as good as you'd hope.
Most of these lists seem like click bait, of the biggest names out there, without regard to fit.
Your looking for a unicorn my friend, there’s no D man that can make Mo look defensively competent. Have we not realized this yet?
Schenn did, Boosh did, Hainsey did.