I'm just guessing, but his name is probably circulating amongst many different fan bases as a "perfect fit" for their team. All I have heard is that he is "unhappy" in AZ and didn't show up at OTA's. Is he unhappy because he thinks the Cardinals suck, doesn't like his role, wants more money? If he wants more money, hard pass on him.
If Sweat is just wanting to play for a new team, then he would probably be worth the trade. I have read that it would probably take a 2027 conditional 4th rounder, that would escalate to a 3rd rounder, depending on set performance levels.
The good news for the Packers is their leg up with having Gannon as their DC. As Sweat's former coach at AZ, Gannon is going to know his value to the Packers defense and how he could be used.
I like Sweat coming to the Packers for that conditional 4th rounder, under his current deal with the Cardinals, but a new contract with new guaranteed money, pass.