The fact is, the offense has been pretty ugle for large chunks of the past 5 years. It's gone downhill--and quite noticeably. Is it all Sanders' fault? No: UT's talent is down some--but lots of teams with less talent than the Vols have offenses that are more productive, more efficient, more well organized. In recent years the OL blocking has fallen off, the WR play has been spotty, there have been lots of penalties, slowness in getting plays off--a lot of problems.
Yes, the defense has been weak in recent years some, too. Special teams have been TERRIBLE for a few years. The whole team has gotten shaky, really. I think when you give Chavis some talent, he will put a good defense on the field. I can't say the same for Sanders. Hell, UT has played three years with pretty much the same group of WRs and yet NONE of those guys as established himself as a dependable, go-to guy. Fulmer has won a lot of pretty ugly games in recent years--but the team's gradually diminishing performances caught up with him this year. The Vols need a new OC.