There are teams with scorers that aren't really going for it this year (Edmonton, Calgary) that would love either D for a player like Hemsky or Cammelleri. It's just a salary issue at that point. But you don't want to trade either until you're fairly certain what they are or going to be. We know Gormley isn't good enough to force his way onto the roster. We know that Rundbald had one hell of a preseason and his raw potential is undeniable.
Holding on to him to see it play out is more about not trading away the next Karlsson than it is getting maximum value. I'm comfortable with trading Gormley, because the coaching staff is comfortable with keeping him in the AHL. Rundblad practically forced his way on to the roster, looked good. We don't know where that upward trend ends, so I'm not comfortable trading him away.
Rundblad also plays the right, so he has that going for him too. Most teams are lucky if they've got a guy banging on the door, forcing roster moves. The Coyotes arguably have three in Stone, Rundblad, and Gormley.