Barkov is an exceptional hockey player. I agree, there's quite a bit of Bergeron in his game, and while his defensive stats aren't necessarily the greatest, that's more a reflection on the dumpster fire defenses he's spent a lot of time playing with. He's always struck me as a very responsible, clever operator and he's been a key piece in Florida's return to playoff contention this season. He probably doesn't have the out-and-out offensive skills of Eichel, but I'd say his all-round game is every bit as good if not better and while his value is sure to increase, it's highly likely to stay below what Jack's earning.
I think he'd be a great fit for the Bruins, his contract's going to expire at just the right time and I'd wager he and Pasta could create magic together. If the Panthers stay on their upward trajectory, which they probably will under Coach Q, he might be hard to entice away, but if I were Sweeney he'd be right up in the top couple on my list of potential future 1Cs.