Again, when was the last time a team got win-now talent for a RFA's rights? It simply doesn't happen.
The last couple of notable RFA trades have been:
-PLD's rights for Vilardi, Iaffalo, Kupari and a 2nd
-DeBrincat's rights for Kubalik, Sebrango, a 1st and a 4th
-Fiala's rights for Faber and a 1st
-Reinhart's rights for Levi and a 1st
These guys aren't being moved for win-now help, they're being moved for primarily futures. There is no reason to think Rossi is going to be any different. Minnesota may want win-now help, but there is no track record of teams trading good players under contract for RFAs who need big contract extensions.
Minnesota's best bet is to get futures for Rossi and then either use those futures for win-now help or keep the futures and spend money in free agency. If they're hoping to directly turn Rossi into win-now help, they're not going to be able to do it, at least if the past RFA trades prove to be indicative of future RFA trades. And him being an RFA without a contract while Minnesota apparently doesn't want to pay him makes their leverage even worse.