Edmonton would not do that. Even signed, he will have a cap hit fairly high, and higher than it currently is. There is nothing to stare he would not get around 5/per on the open market.
Edmonton also has what looks to be a top 5 pick. Ekblad is out there. Unless they can protect a top 10 pick this year in the deal, I do not see it. Also, I think even resigned, they would want a younger D (24-26). His style can break him down very quickly.
Girardi also could be let go, but I think they make all attempts to resign him before trading him. His slow start is not helping him make more money, which could result in him staying here.
Girardi should only be dealt if they will not make the playoffs. He has more value in a playoff run unless someone overpays. This would be overpaying for him. Would rather get a prospect already drafted. Futures are not as inviting. Next year we have a shot to re mold and fully build a top team.