Possibly, it saves PITT cap but thats a high cost.

Zaitsev might be the better fit for PIT, but for a 2nd and Pustinen they might want a bit more cap relief

I don’t think either team does this trade.

Pittsburgh would be trying to free up cap space for a Karlsson deal and wouldn’t want to take on Zaitsev’s contract.

Chicago would want a better return for taking on Petry’s contract, especially with that second year cap hit of $6.25m.

Why exactly should we pay for a dman that we could need and has value?

Hawks probably decline. Value just isn't there for them. Puustinen is a solid bottom 6 type prospect, but with Hawks having drafted 18 forwards in the past two drafts, his value to the Hawks is diminished. I could maybe see the Hawks doing a Zaitsev for Petry and the 2nd deal.