I mean, it is SUPREMELY weird that they couldn't get something for him. But I haven't seen an argument yet for why Bill would turn a trade down for no reason, so I have to believe there were no real offers (or teams couldn't get him to agree to a contract extension). Alternatively, if the trade offer was significantly low (like a conditional 7th), Bill might have valued the reputation hit more of trading a player for peanuts rather than releasing him and letting him choose his destination. Otherwise I'm still stumped.