After getting fired as head coach at Rutgers:
Worked at Texas -- gone when Herman was fired.
Worked Jacksonville -- gone when Meyer got fired
Worked at Vegas -- gone when McDaniel got fired.
I'm not opining on whether he will be a good DC or not but his career after being a head coach at Rutgers is the result of his head coaches getting fired, not him looking for a new job.
Prior to Rutgers, I don't think his employment history is all that odd for a college football assistant.