Nico Harrison will forever be remembered for the Luka Donu010diu0107 trade, but he also made another major blunder during his time as the Mavericks GM. In 2022, he let Jalen Brunson walk in free agency, which led the point guard to sign a four-year deal with the New York Knicks.
Mavericks fans despise Harrison, but Knicks and Lakers fans love him. Without him, those two organizations wouldn't have their two main stars.
Dallas had two different opportunities to re-sign Brunson, contrary to Mark Cuban's assertion that Brunson didn't give the Mavericks that option. The guard was willing and ready to sign a four-year, $55 million extension, but that changed after the trade deadline, when Dallas approached him about re-signing.