Poehling amounted to very little and we could have had O'Reilly for him and, I believe, eventually, what Kotkaniemi becomes.
We can always project, but players don't regularly become what they are projected to become.
Dubois is a known quantity who, entering his prime, can also still improve. He also plays a critical position on any roster and adds depth that drives plays.
I'd risk the perceived ceiling for Barron, which, Imo, is not that of a dominating top pairing RD for the certainty of what we get in Dubois, plus some room to grow in his case, still.
As I stated, I'd also be willing to add the 31st OA and the 37th OA for Winnipeg, were it to be in rebuild mode and looking strictly for futures.