First of all, I predicted that the defense will be,
"a little better than suck, but it won't be terrific either..." I did not proclaim that they will be top 15. I later amended that statement to accepting a
below average D provided a reasonable uptick on offense. Secondly, I think that is a faulty premise. It seems you are assuming the defense for the three teams below UConn will definitely improve by comparison, while UConn languishes. What is that based on? Finally, UConn was 126 out of 129 FBS programs in total defense. They really can't get much worse...at least by comparison to their peers.
Predictions are not made in a vacuum. They are made every single day based on imperfect information. Some bear fruit. Some do not. It's what makes them predictions. At this very moment, the seniors have exhausted their eligibility. On the other side of the spectrum, new signees have not run a single sprint or lifted a single pound under the tutelage of the UConn coaching staff and there are still at least 7 to come (If Edsall has his way). At the end of the day, neither group is effectively on the roster.
Put in real world terms, my Board votes on the next fiscal year's budget seven months in advance. Do you think my supervisor accepts my draft (which is done eight months in advance) without the accompanying assumptions? He might, but hasn't for the last six years I've been doing it.