I agree it's a red flag but not sure I'd call it "huge."
The defensive staff is a problem he needs to own and fix to be successful.
Whether that could be done mid season is a harder call.
Multiple things can be true at the same time IMO.
The loss to Kansas was terrible.
The win/loss record is disastrously bad.
The defensive staff has done a poor job.
AND . . . the best course of action for UT fans, given we are in Year 1 of a coaching change, is to be patient, stay the course, support recruiting and hope for improvement in the off season.
I cannot see how repeatedly proclaiming doom for this staff helps us move forward successfully given where we are in the process of this staff.
Regardless if Sark is the guy, we need a good recruiting class this year, a good offseason, and another good recruiting class next year. All of our efforts should be focused on what supports that happening.