How is becoming a UFA not good for his bank account?
There's another path for him: sign his qualifying offer for this year. Go into next season as an Rfa, at that point he can pretty much force a trade since he can do the 1 year QO again and be a UFA, so if he wants out the B's would pretty much have to trade him next offseason or lose him for nothing the following year.
That's IF he wants to get out, which I don't think he does. But make 3.6 for 1 year and then being traded for by a team that's willing to pay him is absolutely better for his checking account than signing for 4 years below maket price.