Aranda has a three year contract not tied to Miles. And he took the job knowing that Miles was on soft ground. Aranda isn't going anywhere if it all until after the season and he knows who his new boss is. The problem at LSU isn't tied to the defense so he isn't in trouble. Chances are, given the offensive issues at LSU the new coach will have an offensive tilt and will need a guy like Aranda to stick around.