Marleau is not waiving to go back to SJ.
You are not giving enough to NSH for Subban, essentially that is junk for him. Start with Nylander.
You've also managed the cap by still going over. Well done! You're essentially two players short (since Horton goes on LTIR).

Players like Gardiner, don't sign a sign a UFA contract just to be traded. And Nashville if they wanted Gardiner would just sign him as UFA and then trade Subban.
As mentioned above, why do folks keep on trading the untradeable SJ wants cap space too, one reason they never signed Marleau last summer.