Sabres fan coming in peace. If you swap Byram for Power, you're probably closer. That may kill it for you but I really don't see Power going anywhere.
True, I would say that Dobson's importance as a #1 long-term point producer on this blueline - a so coveted righty shot, no less - is easily that of a Dahlin or Power for Buffalo. And no less.
That's not to say he's better than either.
In general, the Isles would be absolutely nuts to move Barzal and Dobson, much less in the same deal, for anything less than similarly aged and proven players who they think would be "bigger gamechangers" on the current roster.
It's possible that a package including one such similar gamechanger with perhaps two bluechippers and a nice pick to boot would make sense too.
The move would have to be a monumental move though.
Then again, there have been few moves so monumental for both teams as that Lafontaine/Turgeon trade back in the day.
It was a doozy among doozies and raised eyebrows all over the hockey world. For good reason.