The top 25 doesn’t mean anything...except in a year when the selection committee doesn’t have much else to use to decide which teams play in the NCAA tournament. This year, it means everything.
Being in the top 25 gives the selection committee permission to go ahead and pick at large-selections as, essentially, automatic bids. In a year with no non-conference play, then, if you’re in the Top 25, you’re in the tourney. If you’re not, well, you get the idea.
Given that, there are teams in the top 25 that baffle me, but of course each of these ranked teams will desperately want to stay on this list for a better shot of getting into the 2021 NCAA tournament.