Not a burning desire to change history, but I’d go with 2 players not getting hurt. Curtis Sumpter in 2005 and Justin Moore in 2022. Nova likely eliminates UNC in the 2005 EE at full strength, and has a good shot at Kansas in the 2022 FF. Both eventual champs.
Then I’d go with the ridiculous ruling keeping Omari Spellman out of the 2016-2017 season for his 8th grade switch to private school (while allowing Omar Yurtseven, a foreign pro player, he’s eligibility the same year). That denied Nova the 3 peat opportunity between the 2016 and 2018 titles.
A lot has to go right to win titles. I won’t go with a shot that could have gone in, rather players that could have played at full strength to have their teams at full strength.