Coaching: Following a season of defensive frustration, Tennessee fired defensive coordinator Tim Banks, outside linebackers coach Levorn Harbin, and secondary coach Willie Martinez to make way for a new defensive staff. The drop-off was never quite disastrous, as the Vols finished no. 42 in FEI and no. 63 in SP+ on defense last fall, but it was the third season in Banks’ five years at the helm where the Vols finished outside of the top 30 in FEI. Banks is replaced by Jim Knowles, the defensive c…