It's depressing to want to improve the defense, and to have to choose which forward(s) I'd be willing to trade to do so?
Even if Hronek and Cholowski AND Sulak all stick with the team, they still need 1-2 more really good defensemen. And I'm not going to assume that all these guys pan out, plus McIsaac pans out, PLUS either Karlsson or Trouba come here. It's statistically one in a million that all those possibilities come up aces, so I'm expecting at least one trade. And I'm not trading Larkin or Zadina, so realistically, it probably comes down to AA and/or Mantha.
I'm not kicking the guy's puppy here. I'm saying that sooner or later, Detroit should move a forward for a defenseman, and the better AA plays, the better the return to help the defense. Replace his name with Mantha if you like, but you need to give to get.