I think Guentzel makes sense for Vancouver to target, but it's largely a question of how they'd fit him in. I imagine Vancouver would have to offer more money than other teams to compensate for taxes in Vancouver being insanely high, something like $8.5 million in Nashville is likely equivalent to $9.5 million in Vancouver. I seriously doubt Vancouver can get Guentzel for an AAV starting in the 8s.
I think Vancouver signing Guentzel would likely require a Boeser trade, which you can argue is a pretty smart asset allocation. Trade a 4th to get Guentzel's UFA rights, sign him and then trade Boeser for a 1st+ seems like a no brainer decision. Especially considering Boeser is a UFA after next year wand likely won't be much cheaper than Guentzel.