It’s uncommon, but within the realm of possibility, for a team to entirely run it back. Two years ago, the Texas A&M Aggies had one of the surprise breakouts when a team picked in the middle of the pack broke out and nearly won the league. The 2022-23 Aggies went 15-3 in league play, despite not crossing into the top 30 in KenPom until very late in the season, and even then finishing 33rd after being bounced out of the NCAA Tournament in round one.
The Aggies ran it back. They returned 8 of their top 9 players and were picked by the media to finish second in the SEC.