So let me see if I am following your logic.
Riley shouldn't have hired Banker.
Riley isn't necessarily making the right decision in firing coaches, (that shouldn't have been hired to begin with)
But because the defense improved from bottom third to middle third, Banker should be given more time, because he hasn't bottomed out yet.
Firing willy nilly gives the impression that it was just random, throw a dart a some pictures. Not sure that is the case.
Do you have examples of some willy nilly firings for me to review? I like to look into these sort of things. Just looking for say 10 situations where a college head coach went willy nilly and fired a staff member so we can determine if the replacement was better or the original hire was better.