An extended Konecny is the only thing that would make me okay with moving down from 4 to 12.
Necas is very skilled but not worth it as a player, in my opinion.
In keeping with the Jackets wanting to make a splash, that would have to mean we would be trading a pick for a prominent player. We can't be trading down just for picks, that's not a splash. And it's easier to see it being Necas than Konecny, given that we know he's available.
Demidov and Lindstrom are too good for this. They're also both filled out and have a lot of polish and detail on their games already. This sort of deal often looks bad 5-10 years down the road, but we could be doing a deal that looks awful in as little as two or three years from now.