UConn could actually finish 20-13 if it were to lose its last two regular season games and win the AAC tourney. That scenario would result in an automatic bid. But there are two other ways to get to 20 wins:
win 1 of 2 regular season games and 2 in the AAC tourney;
or
win 2 regular season games and 1 in the AAC tourney.
I think either of those scenarios would, coupled with being defending champs, get UConn the nod. It would be better if they could get to 21 by winning the last 2 regular season games and then winning 2 in the AAC and making the finals. But I think 20 will do it - only because they are defending champs and defending champs with 20 wins should get in.
In the future though, I agree 20 wins will not be enough, and the schedule will need to be upgraded so that if UConn has 21-23 wins, it will be enough.