I rated the teams the way I did based on the degree of difficulty, which team I thought would beat which, and the level of dominance displayed during the year.
I think really the only question is who is the best among that top 4, really the top 3.
Even though Florida has the most losses among the top 3 (5), I give them credit for repeating as champs. It's so much more difficult going back to back that I felt like the hiccup at the end of the season didn't take away from their dominance, especially considering they won each NCAA tournament game by at least 7 and overall just cruised through the field. Really, from the time the SEC tournament started, they just went to a different level. And that was for the repeat.
With KU and UK, I had to really look because I have always considered those two teams very similar. The weird thing about that KU team is that they were never ranked #1 during the season. They were never lower than 7, and almost always in the top 5, but never 1, until the poll that mattered. That's surprising, but it was also important in ranking them. UK, on the other hand, was never lower than 3 all year, and their only losses were a buzzer beater at Indiana and an SEC tournament loss to Vanderbilt - a team they had already beaten twice before. Less than a third of the games for UK that year were decided by single digits, and of those, only two of their wins the entire season were by less than 5 points. Simply put, teams weren't staying with that UK team. That level of dominance is pretty impressive. They also won 3 rematches during the tournament, avenging the Indiana defeat and beating Louisville and KU for the second time. That's pretty impressive as well.
KU avenged all of their defeats in their title season, except the OSU loss (they only faced the Cowboys once that year). Only four of the Jayhawk wins were by less than 5 points. Like I said, these two teams were extremely similar. But UK seems to grade out just a bit better, so I ranked them ahead.