All of the complex characters in The Final Four develop over the book, and some more than others. One of the characters that develops a lot over the course of the book is Michael Jordan. In the beginning of the book he didn't have the confidence to be a go-to player and attempt a big shot. When his coach tells him to take an open shot, he gains confidence in his game and ends up making a huge shot in overtime, as well as talk trash to the opposing team.
It is kind of the opposite for Malcolm McBride, as he has to try and become more of a team player and not take bad shots. In the beginning of the book he takes a lot of bad shots trying to win the game, but he actually just hurts his team's chances to win. In the end of the book he eventually starts passing to his teammates and realizes that there needs to be teamwork to win the game, which is one of the themes in the book.
The players from Troy do not develop as much as the Michigan State players do though because they already believe in team play and are always passing the ball to the open teammate. They have the same attitude throughout the whole book, which helps keep their underdog team in the ball game.
Here is an article about The Final Four by Paul Volponi. It is a summary written by a student and he gives a solid review of the book. Final Four Article