*All speculation*...
Sounds like Jerry is ready to give the boot both to Greg Zuerlein and John "Bones" Fassel.
It also seems like maybe Jerry wanted to keep Lirim Hajrullahu when he was brought midway through the season, but possibly Bones cried to McCarthy and demanded his boy Zuerlein be kept, thus cornering Jerry into a corner and having to side with keeping Zuerlein just to keep Bones Fassel happy.
I wouldn't doubt if Bones Fassel made a threat of quitting if his boy Zuerlein was let go mid-season.
Now, it seems Jerry has seen enough of the inaccurate Zuerlein and how it has cost the team several games. If Zuerlein costs the Cowboys during the playoffs, don't be surprised if both Zuerlein and Fassel are let go (to the demise of McCarthy).