Other teams know that this team is over a barrel, so regardless of whether it's Brannstrom, Joseph or Kubalik, they are definitely asking for a (significant) sweetener to take any of them on.
From an optics perspective, attaching a pick to move Kubalik would be career suicide for Pierre. You simply can't go from 7th overall > Debrincat > Kubalik > moving an asset to dump Kubalik in the span of 16 months. He'd get raked over the coals, more than he already is.
There'd be some people on this board who'd be, "well, actually, you can't forget about the 1st and Sebrango," but the general sense in the hockey world would be that Dorion is Milbury-esque. It'd seal his fate as a laughing stock.
Dorion is trying to do what's in the best interest of Ottawa, but also what's in the best interest of his career.
Unless Staios gets involved, Kubalik isn't going anywhere.