I really don't know what trade partner for Williams you think you are going to find, or why you think cutting Mixon is a legitimate option at this point. This has kind of become a theme with you, and I really question the legitimacy of the argument at this point in the season.
Williams had his best year in his 4th year, so of course they were going to give him the 5th year option. Unfortunately, it turned out that his 5th year was pretty bad and we were able to upgrade by getting OBJ. But that left them 12 mil on the hook for Williams, that's nobody's fault because the previous year he played well enough to earn the extension. Let's just be thankful that 12 million is only for one year and we didn't extend him into a new contract, because that could have been so much worse. The argument that we should trade him .....with who? ... The Jags were the only team that reported interest and I'm going to say this again, none of us know what their offer was for.....but it wasn't enough to entice the Bengals. That isn't likely to change now. MAYBE someone gets hurt and they find trading partner to take the 12 million off our hands.....but I kind of doubt it. But the 12 million will be off the books by the time the season is over and will allow us from the time the season is over until the start of FA to use that money on other players.
You also made the argument that we should have traded him before the draft. Again ....with who? His trade value was even lower before the draft because teams we going to sit and wait to see if they could get a tackle in the draft. I really do not understand the logic in the trade him before the draft thinking. It makes no sense to me at all.
Now to Mixon....
It was thought that had one of the RBs dropped to 28 they may have take one, that did not happen. In fact the RBs for the value they had them we just not there until Brown in the 5th. And the Derick Henry stuff was never serious, anyone who thought the Titans were going to trade away their best player ....come on...
Which leaves Mixon as RB1 because they are not going to start a 5th round rookie RB on a team that is competing for a Super Bowl.
Let this talk die.