I mean, what do you expect. Rhule brought in a guy to stare over TW's shoulder halfway through the season, like it was the defense that sucked.
No, Snow was here the entire year. It only became public when Holgorsen showed up.
Now, if the argument is that the guy Rhule brought in a year ago to (probably) be the DC when White left didn't end up meshing with White very well played a part in it, that seems likely. Though it sounds to me like the issues are mostly between Rhule and White themselves.