Cooley had built a reputation for himself that was really strong at Providence. They hadn't made the tournament since 2004 before him. He brought them to the tournament 7/12 years he was there, including a Sweet 16 literally 2 years ago.
College sports is a results oriented business, but Cooley was an exception. He was beloved in Providence, and had a lifetime contract if he wanted it. And let's face it, that lifetime contract didn't come with a realistic expectation of winning big because....it's Providence. Before 2022, he had made it out of the first round exactly one time, and then got bounced in the second round. But nobody really cared because........it's Providence.
Then he crumpled it all up and threw it all away. Destroyed his reputation, quit on his team, packed his bags, sold his home, and checked out of the season before the tournament even started. And for what??? Now he has the team he wants and the brand he wants. I think the expectations to Cooley to win will be bigger in the next 3-4 years than it was for his entire career combined. As you said, lots to prove.