Yep, next up is Notre Dame. ND has not been unbeatable lately, though they haven't been exactly beatable. Tennessee could very well go into its Auburn game with a record of 10-7. And if they lose to Auburn, would they really, at that point, qualify as a 8 seed?
There are 32 at large bids but typically of the top 25 ranking only 7 or occasionally 8 of those teams are automatic bids (P5 conference winners plus BE and AAC and sometimes the A10) which means there are 17 or 18 ranked teams taking up at large bids - that leave 14 or 15 unranked teams, so theoretically the teams 26-39 or 40 in the rankings.
At this point TN certainly would be in that range. And they have two quality wins to date - Stanford and KY that will distinguish them from most of the 26-50 range of teams which will not have anything near that quality of win. Where they will stumble in comparison is losses like PSU and OleMiss which are really bad losses to teams not in contention for NCAA spots - but the committee typical overweights good wins and discounts bad losses.
They are a team that is very capable of adding more 'bad losses' to their resume, but they are equally capable of adding more 'good wins' to the resume as well - especially playing in what is a scoring and road challenged and generally weaker SEC than normal.
Finally I think they will get more 'benefit of the doubt' from a majority of the committee than any other team that might be on the bubble.