Pettersson - Letang
POJ - Petry
Dumo - Rutta
Is the same shaky second pairing.
They can't address 2LD with a $4M 3LD who needs to play protected, limited minutes. So trade him now, see what you have in POJ and Smith, and address it before the deadline if needed (which I strongly lean towards needing to do at the moment).
As is, I think they are running it as Dumo-Petry which, isn't much better. That said, I would have more "comfort" I guess if POJ is at 2LD and Dumo is at 3LD and POJ struggles and a swap is needed vs having Smith there. That is, as I said, unless he can come in and prove himself capable.
I said this awhile back too but, you're correct in that they won't be able to address much in the defense with just Dumo as a trade chip. What has to happen (and it's starting to...) is Pettersson prove himself to be 1LD capable and one of POJ or Smith prove themselves to be 2LD capable. Then you trade Dumo out for a third pairing level dman with upside or you package him with something else and get a 2LD capable guy - and my example for that has been Soucy from Seattle. Something like Dumo+Kapanen for Soucy+Donato.
The "defense fix" is for guys to play better. There's not much we can do to bring in help really.