Brian Flores.
One of two things is the case:
a) Flores gave up a 23-point 4th quarter lead to the "worst" team in the league because he was trying to lose (in which case, he's bad at his job because he failed to accomplish that goal), or
b) Flores was actually trying to win and could not stop the freaking Bengals from coming back from a 23-point lead to force OT
To paraphrase Bobby D in Casino, if Flores didn't know how to stop the Bengals then he's too incompetent to keep his job, and if he did know, he was in on it and he still didn't lose the game. Either way, he's out!
There is something to be said for the criticism that if we was trying to lose he did a shitty job and if he was trying to win he also was doing a shitty job.